JPH0613429B2 - Method for manufacturing oxide superconductor - Google Patents
Method for manufacturing oxide superconductorInfo
- Publication number
- JPH0613429B2 JPH0613429B2 JP62122599A JP12259987A JPH0613429B2 JP H0613429 B2 JPH0613429 B2 JP H0613429B2 JP 62122599 A JP62122599 A JP 62122599A JP 12259987 A JP12259987 A JP 12259987A JP H0613429 B2 JPH0613429 B2 JP H0613429B2
- Authority
- JP
- Japan
- Prior art keywords
- oxide superconductor
- superconductor
- current density
- oxide
- superconducting
- 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.)
- Expired - Lifetime
Links
- 239000002887 superconductor Substances 0.000 title claims description 19
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 238000000034 method Methods 0.000 title description 10
- 239000000843 powder Substances 0.000 claims description 14
- 229910002480 Cu-O Inorganic materials 0.000 claims description 11
- 238000010894 electron beam technology Methods 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 6
- 229910052746 lanthanum Inorganic materials 0.000 claims description 4
- 229910052727 yttrium Inorganic materials 0.000 claims description 4
- 229910052706 scandium Inorganic materials 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 description 7
- 238000005245 sintering Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910021193 La 2 O 3 Inorganic materials 0.000 description 2
- 229910020012 Nb—Ti Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000002109 crystal growth method Methods 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 229910002367 SrTiO Inorganic materials 0.000 description 1
- 229910009203 Y-Ba-Cu-O Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- -1 oxide Chemical class 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229910002076 stabilized zirconia Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Description
【発明の詳細な説明】 （技術分野） この発明は、酸化物超電導体の製造方法に関するもので
ある。さらに詳しくは、この発明は、高温超電導体とし
て有用な、臨界電流密度の大きい複合酸化物の超電導体
の製造方法に関するものである。TECHNICAL FIELD The present invention relates to a method for producing an oxide superconductor. More specifically, the present invention relates to a method for producing a composite oxide superconductor having a high critical current density, which is useful as a high temperature superconductor.
（従来の技術） 従来、Nb-Ti合金、Nb金属などの超電導材料は、ヘリウ
ム温度である4.2゜Ｋにおいて用いられてきた。たとえ
ばサイクロントロンに用いられている超電導磁石の線材
は、Nb-Ti合金を使用しており、その臨界電流密度は106
A/cm2と非常に大きく、消費電力の極小化と高磁界の実
現に大きな役割を果たしてきている。(Prior Art) Conventionally, superconducting materials such as Nb-Ti alloy and Nb metal have been used at a helium temperature of 4.2 ° K. For example, the wire of the superconducting magnet used in cyclonetron uses Nb-Ti alloy, and its critical current density is 10 6
It is extremely large at A / cm 2, and has played a major role in minimizing power consumption and achieving high magnetic fields.
このように抵抗が極めて小さい超電導材料は、エネルギ
ー損失の少ない送電線、電力貯蔵、あるいは電磁石、リ
ニアモーターカー、船舶などの広範囲な技術分野に応用
が期待されているものである。Such superconducting materials having extremely low resistance are expected to be applied to a wide range of technical fields such as power transmission lines with low energy loss, power storage, electromagnets, linear motor cars, and ships.
また、高集積化された超ＬＳＩでは、配線抵抗による遅
延時間が問題になっており、超電導体による配線が可能
になれば超高速化が実現される。また、ジョセフソン素
子による超高速スイッチング素子や超高感度磁気センサ
ー、高周波センサーへの応用も期待されている。Further, in a highly integrated VLSI, a delay time due to wiring resistance becomes a problem, and if wiring by a superconductor becomes possible, ultra-high speed is realized. In addition, it is expected to be applied to ultra-high-speed switching devices using Josephson devices, ultra-sensitive magnetic sensors, and high-frequency sensors.
しかしながら、これまでの超電導材料の場合には、ヘリ
ウムを冷却剤としており、高価であるばかりか、取扱い
がめんどうで、しかも大型装置による応用に限定されて
いた。However, in the case of conventional superconducting materials, helium is used as a coolant, which is not only expensive but also cumbersome to handle, and is limited to applications in large-scale equipment.
このような状況に対して、液体窒素温度（77゜K）、あ
るいは室温において動作する超電導材料の実現が強く望
まれていた。これらの温度で動作する超電導体が可能と
なれば、その使用環境条件は緩和され、さらに広範囲な
分野での応用が急速に進む。たとえば、液体窒素温度で
動作すると、冷却装置は２重構造が不要になり、かつ冷
却剤コストが1/40にも低減される。Under these circumstances, it has been strongly desired to realize a superconducting material that operates at liquid nitrogen temperature (77 ° K) or room temperature. If superconductors that can operate at these temperatures become possible, the environmental conditions for their use will be alleviated, and their applications in a wider range of fields will rapidly progress. For example, operating at liquid nitrogen temperatures eliminates the need for double chillers and reduces coolant costs by as much as 1/40.
最近、このような高温で動作する酸化物超電導体が提案
されており、注目されている。これまでに提案されたも
のは、銅を含んだランタン系またはイットリウム系複合
酸化物からなるもので、７７゜K以上の臨界温度（Ｔ
ｃ）を持つものが登場してきている。また、９０゜K以
上の臨界温度（Ｔｃ）を持つものも開発されはじめてい
る。Recently, oxide superconductors that operate at such high temperatures have been proposed and are receiving attention. The ones that have been proposed so far are composed of lanthanum-based or yttrium-based mixed oxides containing copper and have a critical temperature (T
Those with c) are appearing. Also, a material having a critical temperature (Tc) of 90 ° K or higher is beginning to be developed.
これらの酸化物の超電導体の製造法には融液法による単
結晶成長法、ＹＳＺ（イットリウム安定化ジリコニア）
やSrTiO3結晶板を用いたスクリーン印刷法、スパッタリ
ング法による多結晶膜製造法、粉末を焼成する焼結法な
どがある。A single crystal growth method by a melt method, YSZ (yttrium-stabilized zirconia) is used for manufacturing a superconductor of these oxides.
There are a screen printing method using a SrTiO 3 crystal plate, a polycrystalline film manufacturing method by a sputtering method, and a sintering method of firing powder.
しかしながら、これまでの単結晶成長法は0.1×1.5×２
mm2程度の小さな結晶しか得られず、臨界温度（Ｔｃ）
は３０゜Kと低い。多結晶薄膜については、臨界温度で
６０〜８０゜Kまで実現しているが、、基板が限定され
ていること、製造条件のパラメーター制御が難しいとい
う欠点がある。However, the conventional single crystal growth method is 0.1 × 1.5 × 2
Only a crystal as small as mm 2 can be obtained, and the critical temperature (Tc)
Is as low as 30 ° K. Polycrystalline thin films have been realized at a critical temperature of 60 to 80 ° K, but they have the drawbacks of limited substrates and difficulty in controlling the parameters of manufacturing conditions.
焼結法については、線材化やリボン状化が容易である
が、臨界電流密度（Ｊｃ）が小さいという問題がある。Regarding the sintering method, it is easy to form a wire or ribbon, but there is a problem that the critical current density (Jc) is small.
たとえば線材化の場合には、粉末を９００〜１０００℃
で焼結後、Ｃｕ系合金に充填し、伸線加工して細線化す
ることができ、またリボン状への成形も容易であるが、
臨界電流密度（Ｊｃ）が小さいことが、今後の技術展開
の課題になっている。For example, in the case of making a wire, the powder is 900 to 1000 ° C.
After sintering, it can be filled with Cu-based alloy and drawn into a fine wire, and can be easily formed into a ribbon.
The small critical current density (Jc) is an issue for future technological development.
（発明の目的） この発明は、以上の通りの事情を鑑みてなされたもので
あり、高温超電導体として期待されている複合酸化物超
電導体について、従来の製造方法の欠点を改善し、効率
的に臨界電流密度（Ｊｃ）の大きい酸化物超電導体を製
造する方法を提供することを目的としている。(Objects of the Invention) The present invention has been made in view of the above circumstances, and it is possible to improve the efficiency of a complex oxide superconductor, which is expected as a high-temperature superconductor, by improving the drawbacks of the conventional manufacturing method. Another object of the present invention is to provide a method for producing an oxide superconductor having a large critical current density (Jc).
（発明の開示） この発明の製造方法は、Ｍ−Ｌ−Ｃｕ−Ｏ（ただし、Ｍ
＝Ｃａ，Ｓｒ，Ｂａ，Ｌ＝Ｓｃ，Ｙ，Ｌａ系元素）系酸
化物超電導体を製造するにあたって、超電導体が形成す
る所定配合割合の原料粉末を成形した後に、レーザービ
ームまたは電子ビームを照射し、臨界電流密度を増大さ
せることを特徴としている。(Disclosure of the Invention) The manufacturing method of the present invention is based on M-L-Cu-O (provided that M
= Ca, Sr, Ba, L = Sc, Y, La-based element) -based oxide superconductor is manufactured, after forming a raw material powder having a predetermined mixing ratio formed by the superconductor, a laser beam or an electron beam is irradiated. It is characterized by increasing the critical current density.
レーザービームまたは電子ビームを照射することによ
り、極めて短時間のうちに、組成のずれの小さな、かつ
臨界電流密度の大きな複合酸化物の超電導体が得られ
る。By irradiating with a laser beam or an electron beam, a composite oxide superconductor having a small composition shift and a large critical current density can be obtained in an extremely short time.
対象とする酸化物超電導体は、組成式Ｍ−Ｌ−Ｃｕ−Ｏ
（ただし、Ｍ＝Ｃａ，Ｓｒ，Ｂａ，Ｌ＝Ｓｃ，Ｙ，Ｌａ
系元素）で示される複合酸化物超電導体である。The target oxide superconductor is a composition formula ML-Cu-O.
(However, M = Ca, Sr, Ba, L = Sc, Y, La
It is a complex oxide superconductor represented by a system element).
具体的には、Ｓｒ−Ｌａ−Ｃｕ−Ｏ系酸化物、Ｂａ−Ｌ
ａ−Ｃｕ−Ｏ系酸化物、Ｃａ−Ｌａ−Ｃｕ−Ｏ系酸化
物、Ｂａ−Ｙ−Ｃｕ−Ｏ系酸化物、Ｂａ−Ｙｂ−Ｃｕ−
Ｏ系酸化物、Ｂａ−Ｌｕ−Ｃｕ−Ｏ系酸化物、Ｂａ−Ｓ
ｃ−Ｃｕ−Ｏ系酸化物などが例示される。Specifically, Sr-La-Cu-O-based oxide, Ba-L
a-Cu-O-based oxide, Ca-La-Cu-O-based oxide, Ba-Y-Cu-O-based oxide, Ba-Yb-Cu-
O-based oxide, Ba-Lu-Cu-O-based oxide, Ba-S
Examples thereof include c-Cu-O-based oxides.
この発明においては、以上の複合酸化物の所定の組成に
相当する原料粉末を用いて成形するが、その使用割合
は、目的とする超電導材料がペロプスカイト組成を有す
る範囲で選択することができる。In the present invention, the raw material powder corresponding to the predetermined composition of the above complex oxide is used for molding, but the usage ratio can be selected within a range in which the target superconducting material has a perovskite composition.
たとえば、Ｓｒ−Ｌａ−Ｃｕ−Ｏ系酸化物の場合には、
SrCO3：La2O3：ＣｕＯ＝0.5：1.75：２の割合とするこ
とができる。For example, in the case of Sr-La-Cu-O-based oxide,
The ratio can be SrCO 3 : La 2 O 3 : CuO = 0.5: 1.75: 2.
原料粉末としては、酸化物、炭酸塩、硝酸塩、ハロゲン
化物などの適宜な化合物を用いることができる。As the raw material powder, an appropriate compound such as oxide, carbonate, nitrate or halide can be used.
これらの原料粉末は、たとえば、加圧条件下で所定の形
状に成形する。形状には格別の限定はなく、板状、シー
ト状、ペレット状、テープ状、あるいは線状に成形する
ことができる。加圧成形する場合には、広範囲な圧力条
件を採用することができ、１〜１０トン／cm2程度の圧
力も採用することができる。These raw material powders are molded into a predetermined shape under pressure, for example. The shape is not particularly limited, and it can be formed into a plate shape, a sheet shape, a pellet shape, a tape shape, or a linear shape. In the case of pressure molding, a wide range of pressure conditions can be adopted, and a pressure of about 1 to 10 ton / cm 2 can also be adopted.
なお、成形前に原料粉末を予備熱処理することも有効で
ある。この場合には、５００〜１５００℃前後にまで、
たとえば、１〜１００時間予備熱処理することができ
る。It is also effective to preheat the raw material powder before molding. In this case, until around 500-1500 ℃,
For example, the preliminary heat treatment can be performed for 1 to 100 hours.
成形した後に、この発明の方法においては、レーザービ
ーム、または電子ビームを照射する。レーザービームと
しては、２０Ｗ〜２ＫＷ程度のレーザービームが好まし
く用いられる。たとえば、炭酸ガスレーザーがある。電
子ビームの場合には、５Ｗ〜１ＫＷ程度の出力のものを
用いる。レーザービームの照射は、大気中、酸素雰囲気
中で行うのが好ましい。酸素圧としては、たとえば０．
１〜１０気圧程度の範囲とすることができる。また電子
ビーム照射は真空中にて行うのが好ましい。After molding, in the method of the present invention, a laser beam or an electron beam is irradiated. As the laser beam, a laser beam of about 20 W to 2 KW is preferably used. For example, there is a carbon dioxide laser. In the case of an electron beam, an electron beam having an output of about 5 W to 1 kW is used. Irradiation with the laser beam is preferably performed in the air or an oxygen atmosphere. The oxygen pressure is, for example, 0.
It can be set in the range of about 1 to 10 atm. The electron beam irradiation is preferably performed in vacuum.
ビーム照射時のビーム径は、０．１〜５mm程度また成形
物の送り速度は、ビームに対して０．１〜２０ｍ／毎分
とすることができる。The beam diameter at the time of beam irradiation may be about 0.1 to 5 mm, and the feed rate of the molded product may be 0.1 to 20 m / min with respect to the beam.
また、ビーム照射後に、後熱処理を行うことも有効であ
る。この場合には、温度３００〜１０００℃前後、さら
には１５００℃程度までで熱処理を行うことができる。
処理時間は１〜１００時間程度でよい。It is also effective to carry out post heat treatment after beam irradiation. In this case, the heat treatment can be performed at a temperature of about 300 to 1000 ° C., and further up to about 1500 ° C.
The processing time may be about 1 to 100 hours.
もちろん、以上の例示した諸条件は限定的なものではな
い。様々な態様が可能であることはいうまでもない。Of course, the above-exemplified conditions are not limited. It goes without saying that various modes are possible.
この発明の方法によるレーザービームまたは電子ビーム
の照射によって極めて短時間に、急速加熱、急速冷却が
可能となる。このため、照射部分の溶融が瞬間的に起こ
り、蒸発による組成の変動を引き起こすことなしに、粉
末焼結体とは異なる、空隙が少く充填率の高い化合物を
得ることができる。Irradiation with a laser beam or an electron beam according to the method of the present invention enables rapid heating and rapid cooling in an extremely short time. For this reason, it is possible to obtain a compound having few voids and a high filling rate, which is different from the powder sintered body, without instantaneously melting the irradiated portion and causing a change in composition due to evaporation.
このため、粉末焼結体と比較して微倍高い臨界電流密度
（Ｊｃ）が得られる。Therefore, a critical current density (Jc) slightly higher than that of the powder sintered body can be obtained.
以下、実施例を示して、さらにこの発明について詳しく
説明する。Hereinafter, the present invention will be described in more detail with reference to examples.
実施例 (1) La2O3：SrCO3：CuO＝１．７５：０．５：２の割合
の純度９０％以上の原料粉末を混合し、７００℃の温度
で１２時間予備熱処理した。これを粉砕して粉末とし、
プレスにより加圧成形して、径２０mm、厚さ２mmのペレ
ットを製造した。Example (1) Raw material powders having a purity of 90% or more in a ratio of La 2 O 3 : SrCO 3 : CuO = 1.75: 0.5: 2 were mixed and preheated at a temperature of 700 ° C. for 12 hours. Crush this into powder,
The pellets having a diameter of 20 mm and a thickness of 2 mm were manufactured by press molding with a press.
このペレット状試料を毎分４ｍの速度で移動させ、ビー
ム径１mm、出力１００〜５００Ｗの範囲で炭酸ガスレー
ザーを照射した。照射は大気中において行った。The pellet-shaped sample was moved at a speed of 4 m / min and irradiated with a carbon dioxide laser with a beam diameter of 1 mm and an output of 100 to 500 W. Irradiation was performed in the atmosphere.
出力３００Ｗで照射した場合、超電導化合物になった領
域は、断面の幅約１mm、深さ約０．５mmであった。When irradiated with an output of 300 W, the area of the superconducting compound had a width of about 1 mm and a depth of about 0.5 mm.
これらの照射後の試料について、超電導臨界温度（Ｔ
ｃ）、４．２゜Kでの臨界電流密度（Ｊｃ）を測定し
た。その結果は表−１に示した。The superconducting critical temperature (T
c) The critical current density (Jc) at 4.2 ° K was measured. The results are shown in Table-1.
この表−１には、あわせて、通常の粉末焼結法のデータ
も示した。Table 1 also shows the data of the ordinary powder sintering method.
この表−１に示したように、レーザービーム照射した試
料は、通常の焼結法によるものに比べて、Ｊｃ値が約５
倍も上昇した。As shown in Table 1, the sample irradiated with the laser beam had a Jc value of about 5 as compared with that obtained by the normal sintering method.
It doubled.
(2) なお、照射前に予備熱処理を行わない場合には、
Ｔｃは２〜３゜K低くなる。さらに、照射後に７００℃
前後で熱処理すると、Ｔｃは１〜２゜K上昇する。(2) If the preliminary heat treatment is not performed before irradiation,
Tc is lowered by 2-3 ° K. Furthermore, after irradiation 700 ° C
When heat-treated before and after, Tc rises by 1-2 ° K.
(3) 実施例(1)と同様にしてＳｒ−Ｌａ−Ｃｕ−Ｏ酸化
物ペレットを作製した。このペレットを毎分４ｍの速度
で移動させ、ビーム径１mm，出力２０〜２００Ｗの範囲
で電子ビームを真空中で照射した。出力１００Ｗで照射
した場合、超電導化合物になった領域は、断面の幅約1.
2mm，深さ約１mmであった。照射後の試料について超電
導臨界温度（Ｔｃ），４．２Ｋでの臨界電流密度（Ｊ
ｃ）を測定した。その結果は表−２に示す通りであっ
た。通常の粉末焼結法に比べて、約４．５倍も高いＪｃ
値が得られた。(3) Sr-La-Cu-O oxide pellets were prepared in the same manner as in Example (1). This pellet was moved at a speed of 4 m / min, and an electron beam was irradiated in a vacuum with a beam diameter of 1 mm and an output of 20 to 200 W. When irradiated with an output of 100 W, the area of the superconducting compound is about 1.
It was 2 mm and the depth was about 1 mm. Regarding the sample after irradiation, the superconducting critical temperature (Tc) and the critical current density (J
c) was measured. The results are as shown in Table-2. Jc about 4.5 times higher than that of ordinary powder sintering method
The value was obtained.
(4) Ｙ−Ｂａ−Ｃｕ−Ｏ系酸化物の超電導材料によっ
ても、上記と同様のＪｃ増大の効果が確認された。(4) The same effect of increasing Jc as described above was confirmed also by the Y-Ba-Cu-O-based oxide superconducting material.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭57−160975（ＪＰ，Ａ) 特開 昭61−26571（ＪＰ，Ａ) 特開 昭61−17471（ＪＰ，Ａ) Ｐｈｙｓｉｃａｌ Ｒｅｖｉｅｗ Ｌｅ ｔｔｅｒｓ Ｖｏｌ．58 Ｎｏ．９ Ｐ. 908〜912 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-57-160975 (JP, A) JP-A-61-26571 (JP, A) JP-A-61-17471 (JP, A) Physical Review Letters Vol ． 58 No. 9 P. 908 ~ 912
Claims (1)
ｒ，Ｂａ，Ｌ＝Ｓｃ，Ｙ，Ｌａ系元素）系酸化物超電導
体を製造するにあたって、超電導体が形成する所定配合
割合の原料粉末を成形した後に、レーザービームまたは
電子ビームを照射し、臨界電流密度を増大させることを
特徴とする酸化物超電導体の製造方法。1. ML-Cu-O (where M = Ca, S
(r, Ba, L = Sc, Y, La-based element) -based oxide superconductor is manufactured by molding a raw material powder having a predetermined mixing ratio formed by the superconductor and then irradiating it with a laser beam or an electron beam to obtain criticality. A method for producing an oxide superconductor characterized by increasing a current density.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62122599A JPH0613429B2 (en) | 1987-05-21 | 1987-05-21 | Method for manufacturing oxide superconductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62122599A JPH0613429B2 (en) | 1987-05-21 | 1987-05-21 | Method for manufacturing oxide superconductor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63288940A JPS63288940A (en) | 1988-11-25 |
| JPH0613429B2 true JPH0613429B2 (en) | 1994-02-23 |
Family
ID=14839920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62122599A Expired - Lifetime JPH0613429B2 (en) | 1987-05-21 | 1987-05-21 | Method for manufacturing oxide superconductor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0613429B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0816024B2 (en) * | 1987-08-28 | 1996-02-21 | 住友電気工業株式会社 | Manufacturing method of superconducting material |
-
1987
- 1987-05-21 JP JP62122599A patent/JPH0613429B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| ＰｈｙｓｉｃａｌＲｅｖｉｅｗＬｅｔｔｅｒｓＶｏｌ．５８Ｎｏ．９Ｐ．９０８〜９１２ |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63288940A (en) | 1988-11-25 |
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