JP3411357B2 - High pressure solution crystal growth cell for observation - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention produces crystal growth from a solution for crystal growth under high pressure, and observes the process of crystal growth with an optical system to obtain crystal morphology, concentration distribution, and temperature during crystal growth. The present invention relates to an observation high-pressure solution crystal growth cell used for observing changes in distribution and the like.

[0002]

2. Description of the Related Art Crystal growth, which is the process of forming all crystalline solids, usually involves (1) incorporation of molecules constituting the crystalline substance into the crystal surface from the surrounding atmosphere or solution (2) crystal Molecules move to special places on the surface (3) Incorporation of molecules at these places into crystals (4) Dissipation of heat of crystallization from the crystal surface or endotherm . And the rate of crystal growth is limited in any of these four stages. Also, the formation of the first central portion where crystal growth starts is called nucleation.

As a conventional crystal growth cell used for such crystal growth, for example, a container containing a seed crystal and a container containing a solution for crystal growth are connected by a pipe and provided in the middle of the pipe. A solution transfer type in which the crystal growth solution is brought into contact with the seed crystal for crystal growth by opening the valve and transferring the crystal growth solution to the container on the seed crystal side, or a container provided with a partition wall Partitioning the interior, containing the seed crystal in one container and the crystal growth solution in the other container, and moving the partition to open the partition to bring the seed crystal into contact with the crystal growth solution and crystallize. It is equipped with a partition moving type that is made to grow and a crystal growth container that contains a crystal growth solution and a seed crystal storage part that isolates the seed crystal from the crystal growth solution, and moves the seed crystal holder. It had such as the seed crystal transfer type which is adapted to crystal growth by contacting a seed crystal to the crystal growth solution by transferring the seed crystal to the crystal growth solution.

As a high-pressure solution crystal growth cell for causing crystal growth from a crystal growth solution under high pressure, there is, for example, the one shown in FIG.

In the crystal growth cell 51 shown in FIG. 11, a hollow cylinder portion 53 is provided inside the pressure cell 52, and the hollow cylinder portion 5 is provided.
Both ends of 3 are closed by closing members 54 and 55, respectively, and a sliding member 57 is slidably provided in the hollow cylindrical portion 53 through a sealing material 56. Injecting the pressure medium 59 into the pressure cell 52,
This pressure medium 59 pressurizes the crystal growth solution 62 brought into contact with the seed crystal 61 held by the seed crystal holding body 60 via the intermediate sliding member 57, and the crystal growth solution 62 under high pressure. The seed crystal 61 was used as a nucleus to cause crystal growth.

By observing the crystal growth process at this time with an optical system, the crystal form during crystal growth,
I was trying to know the changes in the concentration distribution and temperature distribution.

[0007]

When performing crystal growth experiments on various experimental samples (solutions for crystal growth) using such a crystal growth cell, when observing with an optical microscope or an interference microscope, the sample Since the refractive index is different, it is necessary to design a cell suitable for each sample, and it is difficult to use a general-purpose cell.

Further, in the above optical system, since the detection sensitivity is generally high, the strain due to the pressure application of the observation window provided in the cell may be detected. Therefore, the change of the refractive index of the sample and the strain of the cell may occur. There was a problem in that it could not be distinguished.

Furthermore, when sapphire is used for the observation window, birefringence occurs, which may make observation difficult.

Further, there is a problem that when the crystal growth sample inside the pressure cell is expanded in temperature, the internal pressure rises, which may lead to damage of the cell.

Therefore, it has been a problem to solve these problems as much as possible.

[0012]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, in which crystal growth is generated from a solution for crystal growth under high pressure by using seed crystals as nuclei, and crystal growth at this time is performed. The purpose of this process is to make it possible to observe the above process accurately on the spot by optical observation (interference fringe image, microscope observation, etc.).

[0013]

[Means for Solving the Problems]

The high-pressure solution crystal growth cell for observation according to the present invention is a crystal growth cell for causing crystal growth from a solution for crystal growth under high pressure with a seed crystal as a nucleus, and a crystal growth chamber containing a seed crystal. And a solution cell having a solution enclosing chamber containing a solution for crystal growth, and the solution for crystal growth in the solution enclosing chamber is pressurized with a pressure medium to transfer the solution for crystal growth to the crystal growing chamber and under high pressure. The pressure cell to be maintained and the optically designed observation optical window are provided, and the inner solution cell and the outer pressure cell have a double fitting structure, and the observation optical window is provided in the pressure cell and has a parallelism. It is equipped with a pair of controlled optical observation windows and an optical glass cell which is provided in the solution cell and forms at least the optical path portion of the crystal growth chamber, and an optical glass cell is sandwiched between the pair of optical observation windows. It is characterized in that the crystal growth in the crystal growth chamber was configured to observe by light passing through the pair of optical observation window and an optical glass cell.

In the embodiment of the high-pressure solution crystal growth cell for observation according to the present invention, an optical glass cell having a short optical path length of light passing through the inside of the crystal growth chamber provided in the solution cell is constructed. In the same embodiment, at least a part of the solution enclosing chamber provided in the solution cell is formed by the elastic cell member, and the pressure applied by the pressure medium introduced into the pressure cell is applied through the elastic cell member to the solution enclosing chamber. In the embodiment, the pressure cell may be provided with a pressure compensating mechanism for preventing pressure rise due to temperature rise. In the embodiment, the pressure compensating mechanism can be configured to have an elastic film that absorbs thermal expansion due to temperature rise. Pressure cell may be of a configuration that includes a thermocouple port for measuring the temperature of the pressure medium injection port and the pressure medium to inject pressure medium in the pressure cell.

FIG. 1 shows an embodiment of a high-pressure solution crystal growth cell for observation according to the present invention. The crystal growth cell 1 shown in the drawing has a hollow cylindrical portion 2 formed therein. , Both ends of the hollow cylindrical portion 2 are closed by the closing members 3 and 4,
An elastic cell member 5 is disposed on the right side portion of the hollow cylindrical portion 2 in the drawing, and the inside of the elastic cell member 5 is filled with a crystal growth solution 6
And a crystal growth chamber cell 8 is disposed in the left side portion of the hollow cylindrical portion 2 in the figure, and the inside of the crystal growth chamber cell 8 is formed into a crystal growth chamber 9 for crystal growth. Room 9
The seed crystal 10 is disposed on the inner surface of the hollow tube 2 through the seed crystal support 10a, and the solution enclosing chamber 7 and the crystal growth chamber 9 are communicated with each other through a solution flow passage 11 having a small diameter and a capillary shape.
Inside the cell and the elastic cell member 5 and the crystal growth chamber cell 8
Is formed in the pressure medium chamber 12, and an observation optical window 13 is provided at least at a facing portion outside the hollow cylindrical portion 2 in which the crystal growth chamber 9 is formed, and the light 14 passes through the observation optical window 13. An optical system 15 for optical observation of the crystal growth process
15 has a structure in which a pressure medium pressurizing mechanism 16 having a different structure is connected to the pressure medium chamber 12 via a pipe 17.

In the crystal growth cell 1 having such a structure, crystal growth is caused by using the seed crystal 10 from the crystal growth solution 6 as a nucleus, and the process of crystal growth is observed by an optical system. The chamber 9 is kept in a space state, and the seed crystal 10 is placed inside the chamber 9.
The solution 6 for crystal growth is sealed in the solution sealing chamber 7.

In this state, the pressure medium pressurizing mechanism 16
Thus, the pressure medium 19 is injected into the pressure medium chamber 12 via the pipe 17.

By injecting the pressure medium 19, the elastic cell member 5 is pressed, and as the pressure rises, the crystal growth solution 6 in the solution sealing chamber 7 passes through the solution flow passage 11 and the inside of the crystal growth chamber 9 is passed. Is gradually discharged to the crystal growth solution 6
When the crystal growth chamber 9 fills the crystal growth chamber 9, the pressure of the crystal growth solution 6 in the crystal growth chamber 9 becomes equal to the pressure of the pressure medium 19 in the pressure medium chamber 12.

Then, the solubility of the crystal growth solution 6 decreases with the pressurization of the crystal growth solution, and the crystal growth with the seed crystal 10 as a nucleus is started. The state of this crystal growth is crystallized between the optical systems 15 and 15. It is observed by optical observation with the light 14 that has passed through the growth chamber 9, for example, the appearance is observed by an amplitude modulation microscope, and the environmental phase (temperature / concentration) change due to interference fringes is observed by the two-wavelength interference microscope.

[0021]

In the observation high-pressure solution crystal growth cell according to the present invention, an optically designed observation optical window is provided in the crystal growth cell that causes crystal growth from the crystal growth solution under high pressure with seed crystals as nuclei. Since the structure has been provided, the process of crystal growth (crystal growth and the environmental phase accompanying the crystal growth (temperature , Concentration) change)
Will be accurately observed by optical observation.

In the observation high-pressure solution crystal growth cell according to the present invention, the crystal growth cell includes a solution growth cell having a crystal growth chamber containing a seed crystal and a solution enclosure chamber containing a solution for crystal growth. The solution for crystal growth in the solution enclosing chamber was pressurized with a pressure medium to transfer the solution for crystal growth to the crystal growth chamber, and a pressure cell for maintaining the solution under high pressure was provided to inject the solution into the pressure cell. The pressure medium (eg, kerosene, hydraulic oil, etc.) pressurizes the crystal growth solution in the solution enclosure chamber, eliminating the need for using a sliding member as in the prior art.

An optical glass cell, which is provided in the solution cell and forms at least an optical path portion of the crystal growth chamber, is sandwiched between a pair of optical observation windows provided in the pressure cell and whose parallelism is controlled. By observing the crystal growth with light passing through the pair of optical observation windows and the optical glass cell, the optical observation window provided in the pressure cell and the optical glass cell surface provided in the sample cell Optical observation becomes easy without strict mounting accuracy. In this case, when the solution cell is attached to the pressure cell, if the relative parallelism between the optical observation window of the pressure cell and the optical glass cell surface of the solution cell is about ± 0 degrees and 5 minutes, the image formation is not affected.

Further, the pair of optical observation windows provided in the pressure cell are made of sapphire, and the arrangement is such that the C axis of the sapphire crystal is aligned with or aligned with the observation optical axis, so that birefringence does not occur, The interference fringes can be observed with high accuracy.

Furthermore, an optical glass cell having a short optical path length of light passing through a crystal growth chamber provided in a solution cell is used, and the pressure cell has a rigidity such that the amount of strain due to application of pressure does not pose a problem in optical observation. By making the solution cell a thin optical glass cell with a short optical path length, it becomes a general-purpose observation crystal growth cell that is not affected by the type of crystal growth solution, and the type of crystal growth solution is different. Therefore, even if the refractive index is different, there is no need to design a cell corresponding to the refractive index of each solution. Therefore, when performing crystal growth experiments of various crystal growth solutions, the pressure cell is used as it is without replacement, only the solution cell is replaced, and crystal growth experiments for various crystal growth solutions are performed in-situ. It can be done while observing.

Furthermore, at least a part of the solution enclosing chamber provided in the solution cell is formed by an elastic cell member, and the pressure applied by the pressure medium introduced into the pressure cell is crystallized in the solution enclosing chamber via the elastic cell member. By adopting a configuration in which the solution is transmitted to the growth solution, pressure is applied to the crystal growth solution without using a sliding member as in the conventional case, and the pressure is applied with a simple structure.

Furthermore, by adopting a double fitting structure in which the pressure cell is fitted on the outside of the solution cell, the assembly of the solution cell and the pressure cell becomes simple and highly accurate, and optical observation of the pressure cell is possible. The optical path between the window and the optical glass cell of the solution cell will be accurate, and the vibration resistance and impact resistance will be excellent in a rocket flight environment.

Further, since the pressure cell is provided with a pressure compensating mechanism for preventing the pressure rise due to the temperature rise, the pressure rise due to the temperature rise is prevented, so that the solution cell is used as the pressure cell. It can be stored for a long time in a built-in state, and experiments can be performed by changing the temperature such as heating the cell with a heater, and the crystal growth solution and the pressure medium cause thermal expansion due to the temperature rise. Even in this case, the rise of the internal pressure is prevented, and the damage of the crystal growth cell due to the rise of the internal pressure is avoided.

In this case, since the pressure compensating mechanism has the elastic film for absorbing the thermal expansion due to the temperature rise, the pressure compensating mechanism can have a remarkably simple structure.

Furthermore, the pressure cell is configured so as to have a pressure medium injection port for injecting a pressure medium into the pressure cell and a thermocouple port for measuring the temperature of the pressure medium. The mechanism for injecting the medium becomes simple and the temperature measurement of the pressure medium becomes easy.

[0031]

2 to 10 show an embodiment of a high pressure solution crystal growth cell for observation according to the present invention.
In the crystal growth cell 1 shown in the figure, a hollow cylindrical portion 2 composed of a large diameter portion 2a and a small diameter portion 2b is formed inside a pressure cell 21, and both end sides of the hollow cylindrical portion 2 are closed by a closing member 3. 4, the one closing member 3 is provided with a pressure medium injection port 3a for injecting the pressure medium 19, and the other closing member 4 is a thermocouple for inserting the tip of the thermocouple 22. A port 4a is provided.

A solution cell 23 is fitted and mounted in the hollow cylindrical portion 2 formed in the pressure cell 21.

As shown particularly in FIG. 3, the solution cell 23 has a joint member 25 on one side (center side in the drawing) of the rigid sleeve 24 having the pressure medium inflow hole 24a formed therein.
Is fixed with a screw or the like and the end cap 26 is fixed to the other side (the right side in the drawing) with a screw or the like, and the elastic tube fitting portion 25a formed on the joint member 25 and the elastic tube fitting portion formed on the end cap 26 are fixed. 26a, both ends of the elastic body cell member 5 made of an elastic body tube are bulged, fitted and fixed to form a solution sealing chamber 7 inside the elastic body cell member 5 and outside the elastic body cell member 5. And inside and outside the rigid sleeve 24 the pressure medium chamber 12
Are formed.

Further, the end cap 26 has a solution supply path 2 for supplying the crystal growth solution 6 into the solution sealing chamber 7.
7 is provided with a hollow hole 26b and a closing member 28 of the solution supply path 27 is detachably provided.

On the other hand, the joint member 25 is provided with a hollow hole 25b for forming the solution flow passage 11, and a thin tube 31 is inserted into the hollow hole 25.

On the left side of the joint member 25 in the drawing, an optical glass cell 33 is attached via an adapter 32, and the crystal growth chamber 9 is formed in the optical glass cell 33. The seed crystal 10 can be installed in the crystal growth chamber 9 via the seed crystal support 34.

Further, a rod 35 for holding the seed crystal support 34 and a cap 36 are attached to the left side of the optical glass cell 33 in FIG. 3 to keep the crystal growth chamber 9 in a sealed state.

The solution cell 23 having such a structure is
As shown in particular in FIG. 4, the hollow cylindrical portion 2 formed in the pressure cell 21 is fitted, and the optical glass cell 33 of the solution cell 23 is fitted in the small diameter portion 2b of the hollow cylindrical portion 2. The rigid sleeve 24 has a double structure in which the large diameter portion 2a of the hollow cylindrical portion 2 is fitted.

Then, the hollow cylindrical portion 2 provided in the pressure cell 21.
2 where the optical glass cell 33 constituting the solution cell 23 is located.
And a pair of optical observation windows 43, 43 as shown in FIG.
Is provided, and the optical glass cell 33 and a pair of optical observation windows 43,
The observation optical window 13 is constituted by 43, and a pair of optical systems 15 and 15 are provided so that the optical axis 45 passes through the observation optical window 13.

In this way, the solution cell 23 and the pressure cell 21
By adopting a double fitting structure for and, the optical path formed in the optical glass cell 33 of the solution cell 23 and the optical path formed in the pair of optical observation windows 43, 43 of the pressure cell 21 are matched. And the vibration resistance and shock resistance under rocket flight environment are significantly increased.

Further, the pressure medium 19 is supplied into the pressure cell 21 through the pressure medium injecting joint member 46 to the pressure medium injecting port 3a provided in the closing member 3.

In this embodiment, a sapphire crystal (sapphire glass) 43a as shown in FIG. 6 is used for the pair of optical observation windows 43, 43 provided in the pressure cell 21, and the C axis 43c of the sapphire crystal 43a and FIG. Optical axis 45 shown in
Are provided so as to be coincident with or parallel to each other, whereby birefringence does not occur and interference fringes can be observed.

At this time, the pair of optical observation windows 43, 43
Is attached to the pressure cell 21 with a high degree of parallelism so that interference fringes can be observed, and the pressure cell 21 has a small strain amount that does not pose a problem in optical observation even when pressure is applied. Has high rigidity.

Also, in this embodiment, the solution cell 23
Quartz glass is used as the optical glass cell 33 provided in the optical glass cell 33. As shown in FIG. 7, the crystal growth chamber 9 formed by the optical glass cell 33 has a small width W in the optical axis 45 direction. The crystal growth solution 6 is not affected by the difference in refractive index.

Further, the pressure cell 21 is provided with a pressure compensating mechanism 47 communicating with the hollow cylindrical portion 2, and the solution cell 23 is incorporated in the pressure cell 21 so as to avoid the pressure increase due to the temperature increase. In this state, long-term storage is possible, and even when thermal expansion occurs, the internal pressure is prevented from rising so that damage to the crystal growth cell 1 is prevented.

In this case, as shown in FIG. 9, the elastic film 48 and the elastic film receiving space 49 are used as the pressure compensating mechanism 47.
a block member 49 in which a is formed, the elastic film 48 is not deformed as shown in FIG. 10A when the temperature is low, and when the temperature rises, the elastic film 48 is not deformed.
As shown in (B), the elastic film 48 bulges into the elastic film receiving space 49 to prevent an increase in pressure.

In the crystal growth cell 1 having such a structure, crystal growth is caused by using the seed crystal 10 from the crystal growth solution 6 as a nucleus and the process of crystal growth is observed by an optical system. The chamber 9 is kept in a space state, and the seed crystal 10 is placed inside the chamber 9 via the seed crystal support 34. Further, the closing member 28 is removed and the crystal growth solution is placed in the solution enclosing chamber 7. After putting 6 in, the blocking member 28 is again attached and sealed, and the solution cell 23 thus prepared is mounted in the pressure cell 21 with the blocking member 4 removed from the right side of FIG. It is closed and fixed by the closing member 4. At this time, pressure cell 2
The pressure medium chamber 12 formed between 1 and the solution cell 23 is filled with the pressure medium 19 (however, no pressure is applied).

Next, when the experiment is started, the pressure medium pressurizing mechanism (not shown) is used to inject the pressure medium into the joint member 4.
The pressure medium 19 is supplied under pressure into the pressure medium chamber 12 through the pressure medium injection port 6 and the pressure medium injection port 3a.

As a result, by supplying the pressure medium 19 through the pressure medium inflow hole 24a formed in the rigid sleeve 24, the elastic cell member 5 is pressed, the pressure of the crystal growth solution 6 rises and the solution is sealed. When the crystal growth solution 6 in the chamber 7 is gradually discharged into the crystal growth chamber 9 through the capillary 31 arranged in the solution flow passage 11, and the crystal growth solution 6 fills the crystal growth chamber 9, The pressure of the crystal growth solution 6 in the growth chamber 9 becomes equal to the pressure of the pressure medium 19 in the pressure medium chamber 12.

Then, the solubility of the crystal growth solution 6 decreases with the pressurization of the crystal growth solution 6, and the crystal growth with the seed crystal 10 as a nucleus is started. The state of the crystal growth is observed between the optical systems 15 and 15. It is observed by optical observation with the light 14 that has passed through the growth chamber 9, for example, the appearance is observed by an amplitude modulation microscope, and the environmental phase (temperature / concentration) change due to interference fringes is observed by the two-wavelength interference microscope.

[0051]

As described above, according to the present invention, crystal growth is caused from a crystal growth solution under high pressure with seed crystals as nuclei, and the process of crystal growth at this time is optically observed (interference). It is possible to observe with high precision by fringe observation, microscope observation, etc.), and it is possible to observe changes in crystal morphology, concentration distribution, temperature distribution, etc. during crystal growth, which is a remarkably excellent effect. Also,
A solution cell having a crystal growth chamber containing a seed crystal and a solution enclosure chamber containing a crystal growth solution, and the crystal growth solution in the solution enclosure chamber is pressurized by a pressure medium to grow the crystal growth solution. By constructing it with a pressure cell that is transferred to a chamber and maintained under high pressure, the crystal growth solution in the solution enclosure chamber is pressurized by the pressure medium injected into the pressure cell. It is possible to eliminate the need for a special sliding member, and by using a double mating structure for the inner solution cell and the outer pressure cell, the solution cell and pressure cell can be easily and accurately assembled. As a result, the optical path between the optical observation window of the pressure cell and the optical glass cell of the solution cell becomes accurate, and the vibration resistance and impact resistance under rocket flight environment are excellent. Further, as the observation optical window, a pair of optical observation windows provided in the pressure cell and controlled in parallelism, and an optical glass cell provided in the solution cell and forming at least the optical path portion of the crystal growth chamber are provided. The optical glass cell is sandwiched between the optical observation windows of (1) and the crystal growth in the crystal growth chamber is observed by the light passing through the pair of optical observation windows and the optical glass cell. Further, it is possible to facilitate the optical observation without stricting the mounting accuracy between the optical observation window and the optical glass cell surface provided on the sample cell.

[Brief description of drawings]

FIG. 1 is an explanatory cross-sectional view of a basic configuration showing an embodiment of a high-pressure solution crystal growth cell for observation according to the present invention.

FIG. 2 is a cross-sectional explanatory view showing one embodiment of a high-pressure solution crystal growth cell for observation according to the present invention.

FIG. 3 is an explanatory cross-sectional view of a solution cell forming the crystal growth cell shown in FIG.

4 is a cross-sectional explanatory view showing a fitting structure of the pressure cell shown in FIG. 4 (A) and the solution cell shown in FIG. 4 (B).

FIG. 5 is a cross-sectional explanatory view of an observation optical window.

FIG. 6 is an explanatory view of a slope of a sapphire crystal used for an optical observation window.

FIG. 7 is an explanatory cross-sectional view of an optical glass cell.

FIG. 8 is an explanatory diagram of a pressure compensation mechanism provided in a pressure cell.

9 is an explanatory sectional view showing the pressure compensation mechanism of FIG. 8 in an enlarged manner.

FIG. 10 is an explanatory diagram showing a change in shape of the elastic film in the pressure compensating mechanism when the temperature is steady ((A) in FIG. 10) and when the temperature rises ((B) in FIG. 10).

FIG. 11 is a cross-sectional explanatory view showing the basic structure of a conventional high pressure solution crystal growth cell.

[Explanation of symbols]

1 Crystal growth cell 5 Elastic body cell member 6 Crystal growth solution 7 Solution enclosure 9 Crystal growth chamber 10 seed crystals 11 Solution flow path 12 Pressure medium chamber 13 Observation optical window 14 light 15 Optical system 19 Pressure medium 21 Pressure cell 23 Solution cell 33 Optical glass cell 43 A pair of optical observation windows 47 Pressure compensation mechanism

Front page continuation (72) Inventor Tomihisa Nakamura 2-4-1 Hamamatsucho, Minato-ku, Tokyo Space Development Agency (72) Inventor Hiroto Samejima 2-4-1 Hamamatsucho, Minato-ku, Tokyo No. Space Development Agency (72) Inventor Kazunori Kawasaki No. 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (56) Reference JP-A-7-101794 (JP, A) JP-A-4 -132676 (JP, A) JP-B 45-27620 (JP, B1) JP-B 60-18639 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) C30B 1/00- 35/00 B01J 3/02 B01J 3/04

Claims (6)

(57) [Claims] 1. A crystal growth cell for causing crystal growth from a solution for crystal growth under high pressure with a seed crystal as a nucleus, comprising a crystal growth chamber containing a seed crystal and a solution enclosure chamber containing a solution for crystal growth. And a pressure cell that pressurizes the crystal growth solution in the solution enclosure chamber with a pressure medium to transfer the crystal growth solution to the crystal growth chamber and maintain it under high pressure, and an optically designed observation With an optical window for use, the inner solution cell and the outer pressure cell have a double fitting structure, and the observation optical window is a pair of optical observation windows provided in the pressure cell and having parallelism controlled, and a solution. An optical glass cell provided in the cell and forming at least an optical path portion of the crystal growth chamber is provided, and the optical glass cell is sandwiched between a pair of optical observation windows to observe the crystal growth in the crystal growth chamber. A high-pressure solution crystal growth cell for observation, characterized by observing with light passing through a window and an optical glass cell. 2. The high-pressure solution crystal growth cell for observation according to claim 1, which is an optical glass cell having a short optical path length of light passing through a crystal growth chamber provided in the solution cell. 3. At least a part of a solution enclosing chamber provided in the solution cell is formed by an elastic cell member, and a pressure force by a pressure medium introduced into the pressure cell is used to grow crystals in the solution enclosing chamber via the elastic cell member. The high pressure solution crystal growth cell for observation according to claim 1 or 2, which is transferred to a solution for observation. 4. The high-pressure solution crystal growth cell for observation according to claim 1, wherein the pressure cell is provided with a pressure compensating mechanism for preventing pressure rise due to temperature rise. 5. The high-pressure solution crystal growth cell for observation according to claim 4, wherein the pressure compensation mechanism has an elastic film that absorbs thermal expansion due to temperature rise. 6. The pressure cell has a pressure medium injection port for injecting a pressure medium into the pressure cell and a thermocouple port for measuring the temperature of the pressure medium.
6. A high-pressure solution crystal growth cell for observation according to any one of items 1 to 5.