JPH0250078B2 - - Google Patents
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- Publication number
- JPH0250078B2 JPH0250078B2 JP2608181A JP2608181A JPH0250078B2 JP H0250078 B2 JPH0250078 B2 JP H0250078B2 JP 2608181 A JP2608181 A JP 2608181A JP 2608181 A JP2608181 A JP 2608181A JP H0250078 B2 JPH0250078 B2 JP H0250078B2
- Authority
- JP
- Japan
- Prior art keywords
- single crystal
- light
- absorption
- heat treatment
- raw material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000013078 crystal Substances 0.000 claims description 45
- 238000010438 heat treatment Methods 0.000 claims description 19
- 239000002994 raw material Substances 0.000 claims description 18
- XJUNRGGMKUAPAP-UHFFFAOYSA-N dioxido(dioxo)molybdenum;lead(2+) Chemical compound [Pb+2].[O-][Mo]([O-])(=O)=O XJUNRGGMKUAPAP-UHFFFAOYSA-N 0.000 claims description 15
- 239000012298 atmosphere Substances 0.000 claims description 12
- 238000010304 firing Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 description 25
- 239000012299 nitrogen atmosphere Substances 0.000 description 14
- 230000003287 optical effect Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- 230000031700 light absorption Effects 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000004040 coloring Methods 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- UIZLQMLDSWKZGC-UHFFFAOYSA-N cadmium helium Chemical compound [He].[Cd] UIZLQMLDSWKZGC-UHFFFAOYSA-N 0.000 description 2
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 description 2
- YEXPOXQUZXUXJW-UHFFFAOYSA-N lead(II) oxide Inorganic materials [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 2
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000012300 argon atmosphere Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
Landscapes
- Crystals, And After-Treatments Of Crystals (AREA)
Description
【発明の詳細な説明】
この発明は、改良された特性を有するモリブデ
ン酸鉛単結晶光変調媒体を製造する方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION This invention relates to a method of manufacturing lead molybdate single crystal light modulating media with improved properties.
近年、レーザーを利用した応用機器の実用化、
例えば、レーザーフアクシミリ、レーザープリン
タ等の実用化が急速に進んでいる。このようなレ
ーザーフアクシミリ、レーザープリンタ等の高分
解能レーザー記録装置には、レーザービームの変
調を行うための光変調素子が用いられるが、この
光変調素子としては、現在のところ使い易さ、コ
スト、安定性の点から超音波光変調効果が用いら
れる。 In recent years, the practical application of applied equipment using lasers,
For example, the practical use of laser facsimile machines, laser printers, etc. is rapidly progressing. High-resolution laser recording devices such as laser facsimile machines and laser printers use light modulation elements to modulate laser beams, but at present, these light modulation elements are difficult to use due to their ease of use and cost. , an ultrasonic light modulation effect is used from the viewpoint of stability.
一方超音波光変調媒体として要求される特性は
主に、(1)回折効率が大きく、(2)超音波吸収が小さ
く、(3)温度特性が良く、(4)光学的に均一であり、
(5)光の吸収が小さいこと等があげられる。 On the other hand, the characteristics required for an ultrasonic light modulation medium are (1) high diffraction efficiency, (2) low ultrasonic absorption, (3) good temperature characteristics, (4) optical uniformity,
(5) Low light absorption.
これら(1)、(2)および(3)は材質の固有の特性によ
るもので、モリブデン酸鉛単結晶が、これらの点
で優れていることが知られている。 These (1), (2), and (3) are due to the inherent characteristics of the material, and lead molybdate single crystal is known to be excellent in these points.
またモリブデン酸鉛単結晶は、このような超音
波光変調特性において優れているばかりでなく、
光学的に均質な大形結晶が得やすく、比較的安価
である等の利点を持つ優れた材料である。 Furthermore, lead molybdate single crystal not only has excellent ultrasonic light modulation properties, but also
It is an excellent material that has the advantages of being easy to obtain large optically homogeneous crystals and being relatively inexpensive.
モリブデン酸鉛単結晶は、原料の焼成、原料の
溶解、単結晶の育成、および単結晶ブロツクの熱
処理の各工程を経て製造される。この製造工程中
の単結晶の育成を、気泡、サブグレインバウンダ
リー等が導入しない育成条件で行うことによつて
上記(4)の点を満し、光学的に均質な大形結晶を得
ている。 Lead molybdate single crystals are manufactured through the following steps: firing raw materials, melting raw materials, growing single crystals, and heat treating single crystal blocks. By growing the single crystal during this manufacturing process under growth conditions that do not introduce bubbles, subgrain boundaries, etc., it is possible to satisfy the above point (4) and obtain a large optically homogeneous crystal. There is.
上記(5)の点については、モリブデン酸鉛単結晶
においても、これ迄のところ、短波長領域での吸
収の増大、使用による黒色化の問題が生じてい
る。 Regarding the above point (5), even lead molybdate single crystals have so far had problems of increased absorption in the short wavelength region and blackening due to use.
光変調器で用いられるレーザーとしては、現在
のところ、He−Neレーザー（波長633nｍ）が用
いられる場合が多いが、次第に波長の短かいレー
ザー、例えば、アルゴンレーザー（波長488n
ｍ）、ヘリウム−カドミウムレーザー（波長440n
ｍ）が使用されるようになつて来ている。一般
に、変調媒体中でのレーザー光の吸収は、波長が
短かいほど大きいため、光吸収が従来より小さい
光変調媒体が要求されるようになつて来ている。 At present, He-Ne lasers (wavelength: 633 nm) are often used as lasers for optical modulators, but lasers with shorter wavelengths, such as argon lasers (wavelength: 488 nm) are gradually being used.
m), helium-cadmium laser (wavelength 440n)
m) is beginning to be used. In general, the shorter the wavelength, the greater the absorption of laser light in a modulation medium.Therefore, there is a growing demand for an optical modulation medium with lower light absorption than before.
さらに光変調器は、長時間にわたつて、レーザ
ー光を照射され続けるため、レーザー光あるいは
レーザー光発生に伴う紫外光ないし波長のより短
かい可視光により黒色化現象を起し、吸収が増大
することがある。 Furthermore, since the optical modulator is continuously irradiated with laser light for a long period of time, the laser light or the ultraviolet light or visible light with a shorter wavelength caused by laser light generation causes a blackening phenomenon and increases absorption. Sometimes.
従つて、この発明の目的は、モリブデン酸鉛単
結晶を光変調媒体として用いる場合の問題の解決
即ち短波長レーザ光の吸収を小さくすること、お
よびレーザー光を長時間照射した場合におこる光
変調媒体の吸収の増大を軽減することにある。 Therefore, the purpose of this invention is to solve the problems when using lead molybdate single crystal as a light modulation medium, that is, to reduce the absorption of short wavelength laser light, and to reduce the light modulation that occurs when laser light is irradiated for a long time. The aim is to reduce the increase in absorption of the medium.
本発明は、上記目的を達成するための、改良さ
れたモリブデン酸鉛単結晶光変調媒体の製造方法
を提供することである。 The present invention provides an improved method for manufacturing lead molybdate single crystal light modulating media to achieve the above objects.
本発明は、原料の焼成工程、原料の溶解工程、
単結晶の育成工程、および単結晶から加工された
単結晶ブロツクの熱処理工程を含むモリブデン酸
鉛単結晶光変調媒体の製造方法において、上記工
程のうち少なくとも単結晶の育成工程および単結
晶ブロツクの熱処理の少なくとも一つの工程を不
活性雰囲気中あるいは真空中で行なうようにした
もので、これにより、短波長での光吸収が小さく
長期の使用による黒色化も発生しない光変調用の
モリブデン酸鉛単結晶光変調媒体を得ることがで
きる。 The present invention includes a raw material firing process, a raw material melting process,
In a method for producing a lead molybdate single crystal light modulating medium, which includes a step of growing a single crystal and a step of heat treating a single crystal block processed from the single crystal, at least among the above steps, a step of growing a single crystal and a heat treatment of a single crystal block are provided. At least one step of the process is carried out in an inert atmosphere or in a vacuum, thereby producing a lead molybdate single crystal for light modulation that has low light absorption at short wavelengths and does not cause blackening after long-term use. A light modulation medium can be obtained.
以下に、本発明を実施例について詳細に述べ
る。 In the following, the present invention will be described in detail with reference to examples.
実施例 １
モリブデン酸鉛単結晶の原料である一酸化鉛
（PbO）と三酸化モリブデン（MoO3）をモル比
で１：１となるように秤量し、混合し、白金ボー
トに入れ、窒素雰囲気中で500℃５時間焼成した。
焼成した原料粉末を窒素雰囲気中で白金坩堝中へ
入れ、溶解した。この溶融液から、いわゆる、チ
ヨクラルスキー法によつて、単結晶の育成を行な
つた。この際、雰囲気を、通常の大気中育成とは
異なり、窒素雰囲気とした。この雰囲気の相違に
よると考えられる育成条件の変化はなく、窒素雰
囲気で育成しても、育成される単結晶には、光学
的均一性を阻害する気泡、サブグレインバウンダ
リー等の欠陥の発生は起らない。Example 1 Lead monoxide (PbO) and molybdenum trioxide (MoO 3 ), which are raw materials for lead molybdate single crystal, are weighed and mixed at a molar ratio of 1:1, placed in a platinum boat, and placed in a nitrogen atmosphere. The mixture was baked at 500°C for 5 hours.
The fired raw material powder was placed in a platinum crucible in a nitrogen atmosphere and melted. A single crystal was grown from this melt by the so-called Czyochralski method. At this time, the atmosphere was a nitrogen atmosphere, unlike normal growth in the atmosphere. There is no change in the growth conditions, which is thought to be due to this difference in atmosphere, and even if the single crystal is grown in a nitrogen atmosphere, defects such as bubbles and subgrain boundaries that inhibit optical uniformity will not occur in the grown single crystal. It doesn't happen.
以上のようにして育成された単結晶は、白金坩
堝を用いた通常の大気中育成によつて得たものよ
り、着色が薄い。この単結晶をサイコロ状に加工
した状態で、窒素雰囲気中で熱処理を行なわなく
ても、無色透明な光変調媒体を得ることができ
た。 The single crystal grown as described above has a lighter color than that obtained by normal atmospheric growth using a platinum crucible. It was possible to obtain a colorless and transparent light modulation medium by processing this single crystal into a dice shape without performing heat treatment in a nitrogen atmosphere.
実施例１によつて製造された光変調媒体は後記
する実験に示すように、分光光度計を用い波長−
吸収特性を測定することにより通常の大気中育成
の場合より光の吸収が少なく、光照射による吸収
の増加が軽減されることが確認された。 The light modulation medium produced in Example 1 was measured using a spectrophotometer at wavelengths as shown in the experiment described later.
By measuring the absorption characteristics, it was confirmed that there was less light absorption than in the case of normal growth in the atmosphere, and that the increase in absorption due to light irradiation was reduced.
実施例 ２
実施例１で示したモリブデン酸鉛単結晶の製造
工程、即ち、原料焼成、原料溶解および単結晶育
成の工程をいずれも、従来どおり、大気中で行な
つた場合、得られる単結晶は一般に黄色く着色し
ている。この着色の度合は、単結晶の大口径化、
長尺化とともに増大する。この単結晶を切断、研
磨してサイコロ状の光変調媒体を得る加工工程の
途中で、窒素雰囲気での熱処理を施すことにより
無色透明の光変調媒体を得ることができる。Example 2 When the manufacturing process of the lead molybdate single crystal shown in Example 1, that is, the raw material firing, raw material melting, and single crystal growth steps, were all performed in the atmosphere as before, the resulting single crystal are generally yellow in color. The degree of this coloring depends on the large diameter of the single crystal,
It increases as the length increases. During the process of cutting and polishing this single crystal to obtain a dice-shaped light modulating medium, a colorless and transparent light modulating medium can be obtained by performing heat treatment in a nitrogen atmosphere.
一例として、単結晶を、10mm×10mm×10mmのサ
イコロ状に加工した後、窒素雰囲気中で、700℃
５時間熱処理すると、着色が少なく、無色透明な
光変調媒体を製造することができた。この熱処理
温度が高い程、また熱処理時間が長い程着色が少
なくなる。実施例２の場合も、実施例１と同様の
効果があることが確認されている。 As an example, after processing a single crystal into a dice shape of 10 mm x 10 mm x 10 mm, it is heated to 700°C in a nitrogen atmosphere.
After heat treatment for 5 hours, a colorless and transparent light modulation medium with little coloring could be produced. The higher the heat treatment temperature and the longer the heat treatment time, the less coloring occurs. It has been confirmed that the second embodiment also has the same effect as the first embodiment.
実施例 ３
実施例１で示したように、原料焼成、原料溶
解、単結晶育成を全て窒素雰囲気中で行なつた
後、実施例２で示したように、サイコロ状に加工
し、窒素雰囲気中で熱処理を行なうことにより、
着色が少なく無色透明な光変調媒体を製造するこ
とができた。実施例３による場合は、実施例２に
よる場合よりも、サイコロ状での熱処理時間が短
かくてもすみ、熱処理温度も低くすることができ
る。さらに、実施例２と同様の熱処理条件で熱処
理する場合、実施例１、２で製造された光変調媒
体より着色は少なく、したがつて光変調媒体の吸
収が少ないため、ヘリウム−カドミウムレーザー
で使用することも可能となる。Example 3 As shown in Example 1, raw material firing, raw material melting, and single crystal growth were all performed in a nitrogen atmosphere, and then as shown in Example 2, the material was processed into dice and grown in a nitrogen atmosphere. By performing heat treatment with
It was possible to produce a colorless and transparent light modulation medium with little coloring. In the case of Example 3, the time for heat treatment in the dice shape can be shorter than in the case of Example 2, and the heat treatment temperature can also be lowered. Furthermore, when heat-treated under the same heat-treating conditions as in Example 2, the light modulation medium is less colored than the light modulation media produced in Examples 1 and 2, and therefore the light modulation medium has less absorption, so it can be used in helium-cadmium lasers. It is also possible to do so.
上述した不活性雰囲気中処理の効果を明らかに
するために、次のような実験を行ない、その結果
を第１図および第２図に示す。 In order to clarify the effect of the above-mentioned treatment in an inert atmosphere, the following experiment was conducted, and the results are shown in FIGS. 1 and 2.
原料焼成、原料溶解および単結晶育成の工程を
いずれも従来どおり、大気中で行ない、モリブデ
ン酸鉛単結晶を得、これからサイコロ状の光変調
媒体を切出して試料とした。これらの試料に対し
て、500℃、５時間の酸素中熱処理、500℃５時間
の窒素中熱処理、および700℃、５時間の窒素中
熱処理をそれぞれ施した。各試料について、熱処
理前後において、分光光度計を用いて波長−吸収
特性を測定した。また、熱処理を施した各試料と
熱処理を施さない試料について、螢光灯を照射
し、その照射時間に対する波長吸収特性を測定し
た。こうして得た波長吸収特性から吸収係数を計
算し、これを第１図および第２図に示した。第１
図は、波長488mmの光の吸収係数の変化を示し、
第２図は、波長633mmの光の吸収係数の変化を示
す。なお、吸収係数の計算は次の式によつた。 The steps of raw material firing, raw material melting, and single crystal growth were all carried out in the atmosphere as usual to obtain a lead molybdate single crystal, from which a dice-shaped light modulation medium was cut out and used as a sample. These samples were subjected to heat treatment in oxygen at 500°C for 5 hours, heat treatment in nitrogen at 500°C for 5 hours, and heat treatment in nitrogen at 700°C for 5 hours. For each sample, wavelength-absorption characteristics were measured using a spectrophotometer before and after heat treatment. In addition, each heat-treated sample and a non-heat-treated sample were irradiated with a fluorescent lamp, and the wavelength absorption characteristics with respect to the irradiation time were measured. The absorption coefficient was calculated from the wavelength absorption characteristics thus obtained and is shown in FIGS. 1 and 2. 1st
The figure shows the change in the absorption coefficient of light with a wavelength of 488 mm,
FIG. 2 shows changes in the absorption coefficient of light with a wavelength of 633 mm. The absorption coefficient was calculated using the following formula.
吸収係数Ｒ（cm-1）＝2.303×（光学密度）／ｘ
但し、
光学密度＝log10（Io／Ｉ）
ｘ；媒体中の光透過長
Ip；光の入射強度
Ｉ；光の出射強度
第１図および第２図から明らかなように、窒素
雰囲気中熱処理によつて、吸収係数が小さくなる
ことが明らかであり、この効果は波長の短かい方
（488mm）において顕著であることがわかる。ま
た、長時間の光照射によつても吸収係数が増加し
ていないことがわかる。Absorption coefficient R (cm -1 ) = 2.303 × (optical density) / x However, optical density = log 10 (Io / I) x; Light transmission length in the medium I p ; Incident light intensity I; Outgoing light intensity As is clear from Figures 1 and 2, it is clear that the absorption coefficient decreases by heat treatment in a nitrogen atmosphere, and this effect is noticeable at shorter wavelengths (488 mm). . Furthermore, it can be seen that the absorption coefficient does not increase even after long-term light irradiation.
従つて、窒素雰囲気中での熱処理によつて、ア
ルゴンレーザのような短波長のレーザ光に対する
光変調媒体として、吸収係数の小さい、しかも長
時間の光照射によつても吸収係数の増大しないも
のを得ることができることがわかる。 Therefore, by heat treatment in a nitrogen atmosphere, a material with a small absorption coefficient that does not increase even after long-term light irradiation can be used as an optical modulation medium for short wavelength laser light such as an argon laser. It turns out that you can get
なお、吸収係数の減少と、光照射による吸収係
数の増加の抑制効果は、熱処理を窒素雰囲気中で
行なう場合だけでなく、原料焼成、原料溶解、お
よび単結晶育成のいずれかの工程を窒素雰囲気中
で行なうことによつて、得られることが、実験的
に確認されている。 Note that the effect of reducing the absorption coefficient and suppressing the increase in the absorption coefficient due to light irradiation is not only achieved when heat treatment is performed in a nitrogen atmosphere, but also when any of the steps of raw material firing, raw material melting, and single crystal growth are performed in a nitrogen atmosphere. It has been experimentally confirmed that this can be achieved by conducting the experiment inside.
また、窒素雰囲気に代えて、アルゴン雰囲気で
も同様の効果が達成される。一般に、不活性雰囲
気が同様に採用されるばかりでなく、真空も同様
に利用できることが確認された。 Moreover, the same effect can be achieved by using an argon atmosphere instead of a nitrogen atmosphere. In general, it has been found that not only an inert atmosphere can be employed as well, but also a vacuum can be utilized as well.
上述のように、本発明は、モリブデン酸鉛単結
晶の光変調器用媒体の製造方法において、原料の
焼成、原料の溶解、単結晶の育成、単結晶ブロツ
クの熱処理のうち少くとも単結晶の育成および単
結晶ブロツクの熱処理の少なくとも一つの工程を
不活性雰囲気中あるいは真空中で行なうもので、
これにより短波長側での光吸収係数が小さく、長
時間の光照射によつても吸収の増大のほとんどな
い光変調媒体を得ることが可能となる。 As described above, the present invention provides a method for manufacturing a lead molybdate single crystal optical modulator medium, in which at least one of the steps of firing a raw material, melting a raw material, growing a single crystal, and heat treating a single crystal block is performed. and at least one step of heat treatment of the single crystal block is carried out in an inert atmosphere or in vacuum,
This makes it possible to obtain a light modulation medium that has a small light absorption coefficient on the short wavelength side and shows almost no increase in absorption even after long-term light irradiation.
図は、不活性雰囲気での熱処理の効果を示すた
めの実験データを示すグラフで、第１図は、波長
488mmの光に対する吸収係数と光照射時間に対す
る変化を示し、第２図は、波長633mmの光に対す
る吸収係数と光照射時間に対する変化を示す。
The figure is a graph showing experimental data to show the effect of heat treatment in an inert atmosphere.
FIG. 2 shows the absorption coefficient for light with a wavelength of 488 mm and its change with respect to light irradiation time, and FIG. 2 shows the absorption coefficient with respect to light with a wavelength of 633 mm and its change with respect to light irradiation time.
Claims (1)
育成工程、および単結晶ブロツクの熱処理工程を
含むモリブデン酸鉛単結晶光変調媒体の製造方法
において、上記工程のうち少なくとも単結晶の育
成工程および単結晶ブロツクの熱処理工程の少な
くとも一つの工程を不活性雰囲気中あるいは真空
中で行なうようにしたことを特徴とするモリブデ
ン酸鉛単結晶光変調媒体の製造方法。1. A method for producing a lead molybdate single crystal light modulation medium including a raw material firing step, a raw material melting step, a single crystal growing step, and a single crystal block heat treatment step, at least the single crystal growing step and 1. A method for producing a lead molybdate single crystal light modulating medium, characterized in that at least one step of heat treating a single crystal block is carried out in an inert atmosphere or in a vacuum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2608181A JPS57145100A (en) | 1981-02-26 | 1981-02-26 | Preparation of light-modulating medium made of lead molybdate single crystal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2608181A JPS57145100A (en) | 1981-02-26 | 1981-02-26 | Preparation of light-modulating medium made of lead molybdate single crystal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57145100A JPS57145100A (en) | 1982-09-07 |
| JPH0250078B2 true JPH0250078B2 (en) | 1990-11-01 |
Family
ID=12183673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2608181A Granted JPS57145100A (en) | 1981-02-26 | 1981-02-26 | Preparation of light-modulating medium made of lead molybdate single crystal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57145100A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102071466B (en) * | 2010-12-24 | 2012-10-17 | 金堆城钼业股份有限公司 | Method for preparing lead molybdate polycrystalline material |
-
1981
- 1981-02-26 JP JP2608181A patent/JPS57145100A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57145100A (en) | 1982-09-07 |
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