JPS63225524A - Production of compound superconductive body - Google Patents
Production of compound superconductive bodyInfo
- Publication number
- JPS63225524A JPS63225524A JP62056754A JP5675487A JPS63225524A JP S63225524 A JPS63225524 A JP S63225524A JP 62056754 A JP62056754 A JP 62056754A JP 5675487 A JP5675487 A JP 5675487A JP S63225524 A JPS63225524 A JP S63225524A
- Authority
- JP
- Japan
- Prior art keywords
- green compact
- stage
- temperature
- compound superconductor
- producing
- 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.)
- Pending
Links
- 150000001875 compounds Chemical class 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 239000000843 powder Substances 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 239000002887 superconductor Substances 0.000 claims description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 3
- 238000010583 slow cooling Methods 0.000 claims 1
- 238000001816 cooling Methods 0.000 abstract description 5
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 abstract description 4
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 abstract description 4
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum oxide Inorganic materials [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 abstract description 2
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 abstract description 2
- 238000010298 pulverizing process Methods 0.000 abstract description 2
- 239000000047 product Substances 0.000 abstract 2
- 239000013078 crystal Substances 0.000 description 5
- 239000002356 single layer Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 208000003251 Pruritus Diseases 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000013213 extrapolation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
- H10N60/01—Manufacture or treatment
- H10N60/0268—Manufacture or treatment of devices comprising copper oxide
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Superconductor Devices And Manufacturing Methods Thereof (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
Description
【発明の詳細な説明】 〔発明の目的］ （産業上の利用分野） 本発明は、゛化合物超電導体の製造方法に係り。[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a method for manufacturing a compound superconductor.
特に、上部臨界磁界（ｌＩｃ２）を大幅に向上させるこ
とができるようにした層状ペロブスカイト型化合物超電
導体の製造方法に関する。In particular, the present invention relates to a method of manufacturing a layered perovskite compound superconductor that can significantly improve the upper critical magnetic field (lIc2).
（従来の技術） 化合物超電導体を結晶構造で分類すると。(Conventional technology) Classifying compound superconductors by crystal structure.
Ａ１５型、 Ｂｌ型、シェブレル型、ラーヴエス型、ペ
ロブスカイト型１層状ペロブスカイト型などに分類され
る。このうち層状ペロブスカイト型化合物超電導体は、
他の化合物超電導体に比べて臨界温度（Ｔｃ）が３０に
以上と非常に高いものが多い。これらの中で、特に、
Ｂａ−Ｌａ−Ｃｕ−０化合物は高い臨界温度（Ｔｃ）を
持っている。しかし、その上部臨界磁界（ｌＩｃ２）は
約０．Ｉ Ｔ （テスラ）と非常に低い。It is classified into A15 type, Bl type, Chevrell type, Laves type, perovskite type, single-layer perovskite type, etc. Among these, layered perovskite compound superconductors are
Compared to other compound superconductors, many have extremely high critical temperatures (Tc) of 30 or more. Among these, especially
The Ba-La-Cu-0 compound has a high critical temperature (Tc). However, its upper critical magnetic field (lIc2) is about 0. IT (Tesla) is very low.
このため、この層状ペロブスカイト型化合物超電導体を
高磁界にさらされる超電導マグネットへ使用することは
困難視されていた。For this reason, it has been considered difficult to use this layered perovskite compound superconductor in superconducting magnets that are exposed to high magnetic fields.
このように１層状ペロブスカイト型化合物超電導体は、
臨界温度（Ｔｃ）が高いという利点がある反面、上部臨
界磁界（Ｈｅ２）が低いために応用性に欠ける問題があ
った。In this way, the single-layer perovskite compound superconductor is
Although it has the advantage of having a high critical temperature (Tc), it has the problem of lack of applicability due to the low upper critical magnetic field (He2).
（発明が解決しようとする問題点）
上述の如く１層状ペロブスカイト型化合物超電導体は、
上部臨界磁界（１１ｃ２）が低いが故に高磁界の超電導
マグネットに使用することができなかった。(Problems to be solved by the invention) As mentioned above, the single-layer perovskite compound superconductor is
Because the upper critical magnetic field (11c2) is low, it could not be used for high-field superconducting magnets.
そこで本発明は９層状ペロブスカイト型結晶構造を持ち
、臨界温度（Ｔｅ）が３０に以−にと高く、シかも、！
二部臨界磁界（ｌＩｃ２）が５０７を越える改良された
化合物超電導体の製造方法を提供することを目的として
いる。Therefore, the present invention has a nine-layered perovskite crystal structure, and the critical temperature (Te) is much higher than 30.
The object of the present invention is to provide an improved method for producing a compound superconductor having a two-part critical magnetic field (lIc2) exceeding 507.
［発明の構成］
（問題点を解決するための手段）
本発明によれば１層状ペロブスカイト型の化合物超電導
体を構成する元素を含む複数の粉末体を混合する第１の
工程と、この第１の工程で得られた混合物に圧力を加え
て圧粉体とする第２の工程と、上記圧粉体に熱処理を施
す第３の工程と。[Structure of the Invention] (Means for Solving the Problems) According to the present invention, a first step of mixing a plurality of powder bodies containing elements constituting a single-layer perovskite compound superconductor; a second step of applying pressure to the mixture obtained in the step to form a green compact; and a third step of subjecting the green compact to heat treatment.
この工程を経た圧粉体を粉砕して混合する第４の工程と
、この工程によって得られた混合物に１ｆｆ度圧力を加
えて圧粉体とする第５の工程と、この工程によって得ら
れた圧粉体に熱処理を施す第６の工程とからな、る化合
物超電導体の製造方法が提供される。A fourth step of pulverizing and mixing the green compact obtained through this step, a fifth step of applying 1ff degree pressure to the mixture obtained in this step to form a green compact, and A method for manufacturing a compound superconductor is provided, which comprises a sixth step of heat-treating a green compact.
さらに詳しく述べると、第１の工程での粉末体は、 Ｌ
ａ ２Ｏ３、ＢａＣ０、ＣｕＯであり、これらは純度９
９．９％以上ものが用いられる。純度が上記値以下の場
合には、生成される層状ペロブスカイト型化合物の中に
多くの不純物が混入し、これが原因して臨界温度（Ｔｃ
）、上部臨界磁界（ｌＩｃ２）などの超電導特性を低下
させる。第２および第５の工程における圧力は、３〜１
５００ｋｇ／ （！−の範囲が望ましい。To explain in more detail, the powder in the first step is L
a 2O3, BaC0, CuO, which have a purity of 9
9.9% or more is used. If the purity is below the above value, many impurities will be mixed into the layered perovskite compound to be produced, which will cause the critical temperature (Tc
), lowering the superconducting properties such as the upper critical magnetic field (lIc2). The pressure in the second and fifth steps is 3 to 1
A range of 500 kg/ (!- is desirable.
圧力が３ｋｇ／ｃｊ未満の場合には圧粉体を形成するこ
とが困難であり、また得られた化合物の超電導特性も低
い。一方、圧力が１５００ｋｇ／ ｃ−を越えても超電
導特性は低下する。第３の工程では、酸素分圧が０．２
気圧以上の雰囲気下で、熱処理温度を９００〜１１００
℃の範囲、温度保持時間を１時間以上とし。When the pressure is less than 3 kg/cj, it is difficult to form a green compact, and the superconducting properties of the obtained compound are also low. On the other hand, even if the pressure exceeds 1500 kg/c-, the superconducting properties deteriorate. In the third step, the oxygen partial pressure is 0.2
The heat treatment temperature is 900 to 1100 in an atmosphere above atmospheric pressure.
℃ range and temperature holding time for 1 hour or more.
かつ熱処理温度から６００℃まで降温速度を毎分１０℃
以下にすると、上部臨界磁界（ｌＩｃ２）の高い超電導
特性が得られる。熱処理温度が上記範囲をはずれ、温度
保持時間が１時間未満では層状ペロブスカイト型化合物
の生成量が少なくなる。また、酸素分圧が０．２気圧未
満の場合には酸素の量が不足し、これが原因して結晶構
造の安定した規則性の高い層状ペロブスカイト型化合物
を生成することができない。熱処理温度から６００℃ま
での降温速度を毎分ｌＯ℃程度以下に抑えない場合には
冷却段階でミクロ・的な割れが生じる。第６の工程にお
いても第３の工程と同様なことが言えるが、温度保持時
間が２０時間以上と第３の工程の場合より長くしなけれ
ば、結晶の規則性の高い充分な量の層状ペロブスカイト
型化合物が得られず、高い上部臨界磁界（Ｈｅ２）は得
られない。And the cooling rate from the heat treatment temperature to 600℃ is 10℃ per minute.
If it is set below, superconducting characteristics with a high upper critical magnetic field (lIc2) can be obtained. If the heat treatment temperature is outside the above range and the temperature holding time is less than 1 hour, the amount of layered perovskite compound produced will be small. Further, when the oxygen partial pressure is less than 0.2 atm, the amount of oxygen is insufficient, and as a result, a layered perovskite compound with a stable crystal structure and highly regularity cannot be produced. If the cooling rate from the heat treatment temperature to 600° C. is not suppressed to about 10° C. per minute or less, microscopic cracks will occur during the cooling stage. The same thing can be said about the 6th step as in the 3rd step, but unless the temperature holding time is longer than 20 hours or longer than in the 3rd step, a sufficient amount of layered perovskite with high crystal regularity can be obtained. type compound is not obtained, and a high upper critical magnetic field (He2) is not obtained.
（作用）
このような製造方法の採用によって、上部臨界磁界（ｌ
Ｉｃ２）を５Ｂ〜８０Ｔまで向上させ得ることが実験的
に確められた。これは原料が不純物のない状態で均一に
混合されるのでサンプル内での濃度変化がなく、また粒
間に不純物が存在せず、このために高純度高均質で結晶
の規則性の良い層状べロブスカイト型化合物超電導体が
サンプル全体に亙って生成されて電子比熱係数、比抵抗
等を増加させ、この結果として上部臨界磁界（ｌＩｃ２
）が向上すると言う理由に基づくものと予想される。(Function) By adopting such a manufacturing method, the upper critical magnetic field (l
It has been experimentally confirmed that Ic2) can be improved from 5B to 80T. This is because the raw materials are mixed uniformly without impurities, so there is no change in concentration within the sample, and there are no impurities between grains, resulting in a layered product with high purity, high homogeneity, and good crystal regularity. A lobskite-type compound superconductor is generated throughout the sample, increasing the electronic specific heat coefficient, resistivity, etc., and as a result, the upper critical magnetic field (lIc2
) is expected to improve.
（実施例） 以下、実施例を説明する。(Example) Examples will be described below.
純度９９．９％のＬａ ２Ｏ３、ＢａＣＯ３，同じく純
度９９．９％のＣｕＯの粉末をそれぞれ０．５４８：０
．０６７：０．３８５（モル比）でボールミル中で混合
撹拌（第１の工程）シ、これにプレスでｌ０００ｋｇ／
ｃｊの圧力を加えて圧粉体を作った（第２の工程）。Powders of La2O3, BaCO3, and CuO, each with a purity of 99.9%, were mixed at 0.548:0.
．． 067: 0.385 (molar ratio), mixed and stirred in a ball mill (first step), and then pressed at 1000 kg/
A compact was made by applying a pressure of cj (second step).
次に、この圧粉体を酸素分圧０．２気圧の雰囲気、昇温
速度３５’Ｃ／ｓｉｎの条件で９５０℃まで温度−上昇
させ、５時間保持した後、６００℃までは８℃／ｇｉｎ
の降温速度で徐冷し、続いて室温までは約１００℃／ａ
ｉｎの降温速度で急冷した（第３の工程）。このように
して熱処理の終了した圧粉体を再びホールミル中で粉砕
。Next, the temperature of this green compact was raised to 950°C in an atmosphere with an oxygen partial pressure of 0.2 atm and a temperature increase rate of 35'C/sin, and after holding for 5 hours, the temperature was increased to 8°C/sin until 600°C. gin
100°C/a to room temperature.
The sample was rapidly cooled at a temperature decreasing rate of in (third step). The green compact that has been heat-treated in this way is ground again in a whole mill.
混合、撹拌しく第４の工程）、続いて、この混合物にプ
レスで１０００ｋｇ／ ｃ−の圧力を加えて再度、圧粉
体を作った（第５の工程）。次に、この圧粉体を酸素分
圧０．２気圧の雰囲気、昇温速度３５℃１ＩＩＩＩｎの
条件で９５０℃まで温度上昇させ、２４時間保持した後
、６００℃までは８℃／＋Ｉｎの降温速度で徐冷し。Then, a pressure of 1000 kg/c- was applied to this mixture using a press to make a powder compact again (fifth step). Next, the temperature of this green compact was raised to 950°C in an atmosphere with an oxygen partial pressure of 0.2 atm and a temperature increase rate of 35°C 1IIIn, and after holding for 24 hours, the temperature was decreased by 8°C/+In until it reached 600°C. Cool slowly.
続いて室温まで１００℃／ｗｉｎで急冷した（第６の工
程）。Subsequently, it was rapidly cooled to room temperature at 100° C./win (sixth step).
このような工程を経て製造されたサンプルについてＸ線
分光分析を行なったところ、高均質なＬａ１．７８Ｂａ
Ｏ，２２Ｃｕ１．２５０４−Ｙ’組成式を持９層状６０
ブスカイト型化合物超電導体がサンプル全体に亙って生
成されていることが確認された。また、このサンプルに
ついて超電導特性を測定したところ。When X-ray spectroscopic analysis was performed on the sample manufactured through such a process, it was found that highly homogeneous La1.78Ba
O,22Cu1.2504-Y' has a 9-layered structure 60
It was confirmed that buskite-type compound superconductors were generated throughout the sample. We also measured the superconducting properties of this sample.
第１図および第２図に示す結果が得られた。第１図は磁
界がＯＴから２１．ＩＴまでの６段階における温度変化
に対する抵抗変化を示すもので１図中矢印は各磁界にお
ける臨界温度（Ｔｅ）を示している。The results shown in FIGS. 1 and 2 were obtained. Figure 1 shows that the magnetic field is 21. It shows the resistance change with respect to temperature change in six stages up to IT, and the arrows in Figure 1 indicate the critical temperature (Te) in each magnetic field.
この図から判かるように磁界が零のときにおける臨界温
度（Ｔｃ）は３３．５Ｋ 、また２１．ＩＴの磁界中で
の臨界温度（Ｔｃ）は２５にと非常に高い値を示してい
る。As can be seen from this figure, the critical temperature (Tc) when the magnetic field is zero is 33.5K and 21. The critical temperature (Tc) of IT in a magnetic field is as high as 25.
一方、第２図は第１図から読み取った臨界温度（Ｔｃ）
を磁界の変化としてプロットした図で、Ａ界磁界（ｌＩ
ｃ２）の温度変化として示している。この図から温度が
ＩＫ下がれば上部臨界磁界（ｌＩｃ２）は２．４Ｔ上昇
していることが判かる。そして、これから直線外挿して
０（に）における上部臨界磁界（ＩＩ ｃ ２ ＊ ）
を求めると８０Ｔと高い値が得られ、またＷＨＨ理論を
考慮して０（Ｋ）における上部臨界磁界（Ｉｔｃｈ）を
求めても５６Ｔと高い値が得られる。この値は従来の０
．Ｉ Ｔを大幅に上回っており１本発明の有効性が理解
される。On the other hand, Figure 2 shows the critical temperature (Tc) read from Figure 1.
is plotted as a change in the magnetic field, and the A field magnetic field (lI
It is shown as the temperature change of c2). It can be seen from this figure that if the temperature decreases by IK, the upper critical magnetic field (lIc2) increases by 2.4T. Then, by linear extrapolation from this, the upper critical magnetic field at 0 (II c 2 *)
A high value of 80T is obtained, and a high value of 56T is obtained when the upper critical magnetic field (Itch) at 0 (K) is obtained in consideration of the WHH theory. This value is the conventional 0
．． The effectiveness of the present invention can be understood as it significantly exceeds IT.
なお９本発明は上記実施例に限定されるものではない。Note that the present invention is not limited to the above embodiments.
すなわち、第２から第３までの工程は１度に限らず複数
回繰返し行なってもよい。また。That is, the second to third steps may be repeated not only once but multiple times. Also.
第２および第５工程における条件、第３および第６エ程
における条件は前述した範囲内であればよい。また、第
１の工程で用いる粉末体は、実施例の粉末体に限らず１
層状ペロブスカイト型化合物超電導体を構成する元素を
含む粉末体であればよい。The conditions in the second and fifth steps and the conditions in the third and sixth steps may be within the ranges described above. In addition, the powder used in the first step is not limited to the powder in the example.
Any powder containing the elements constituting the layered perovskite compound superconductor may be used.
［発明の効果］
以上述べたように２本発明によれば、今まで困難視され
ていた高磁界への応用可能な層状ペロブスカイト型の化
合物超電導体の製造方法を提供できる。[Effects of the Invention] As described above, according to the two aspects of the present invention, it is possible to provide a method for producing a layered perovskite compound superconductor that can be applied to high magnetic fields, which has been considered difficult until now.
第１図は本発明製造方法によって得られた化合物超電導
体の各磁界における抵抗の温度変化を示す図、第２図は
本発明製造方法によって得られた化合物超電導体の上部
臨界磁界（ｌＩｃ２）の温度変化を示す図である。
出願人代理人 弁理士 鈴江武彦
手続補正書
特許庁長官 黒 １）明 雄 殿
１、事件の表示
特願昭６２−５６７５４号
２、発明の名称
化合物超電導体の製造方法
３、補正をする者
事件との関係 特許出願人
武藤芳雄（ほか６名）
４、代理人
東京都千代田区霞が関３丁目７番２号ＵＢＥピル６、補
正の対象
明［１書
７、補正の内容
（１）明１１１ｍの第５頁５行目に「Ｌａ ２Ｏ３、Ｂ
ａＣ０。
ＣｕＯＪとあるのをｒ Ｌａ２０ ：ｌ 、 ＢａＣＯ
３，ＣＬＩＯＪと訂正する。Fig. 1 is a diagram showing temperature changes in resistance in each magnetic field of the compound superconductor obtained by the production method of the present invention, and Fig. 2 is a diagram showing the upper critical magnetic field (lIc2) of the compound superconductor obtained by the production method of the present invention. FIG. 3 is a diagram showing temperature changes. Applicant's representative Patent attorney Takehiko Suzue Procedural amendment Commissioner of the Patent Office Black 1) Yu Akira1, Indication of the case Japanese Patent Application No. 62-567542, Name of the invention Process for manufacturing compound superconductor 3, Person making the amendment Case Relationship with Patent applicant Yoshio Muto (and 6 others) 4. Agent UBE Pill 6, 3-7-2 Kasumigaseki, Chiyoda-ku, Tokyo, Subject of amendment Ming [1 Book 7, Contents of amendment (1) Ming 111m On page 5, line 5, “La 2O3, B
aC0. CuOJ is r La20:l, BaCO
3. Correct it as CLIOJ.
Claims (6)
る元素を含む複数の粉末体を混合する第１の工程と、こ
の第１の工程で得られた混合物に圧力を加えて圧粉体と
する第２の工程と、上記圧粉体に熱処理を施す第３の工
程と、この工程を経た圧粉体を粉砕して混合する第４の
工程と、この工程によって得られた混合物に再度圧力を
加えて圧粉体とする第５の工程と、この工程によって得
られた圧粉体に熱処理を施す第６の工程とを具備してな
ることを特徴とする化合物超電導体の製造方法。(1) A first step of mixing a plurality of powder bodies containing elements constituting a layered perovskite compound superconductor, and a second step of applying pressure to the mixture obtained in this first step to form a green compact. Step 2, a third step of heat-treating the green compact, a fourth step of crushing and mixing the green compact that has undergone this step, and applying pressure again to the mixture obtained in this step. 1. A method for manufacturing a compound superconductor, comprising: a fifth step of producing a green compact; and a sixth step of subjecting the green compact obtained in this step to heat treatment.
ＣｕＯであることを特徴とする特許請求の範囲第１項記
載の化合物超電導体の製造方法。(2) The powder body includes La_2O_3, BaCO_3,
2. The method for producing a compound superconductor according to claim 1, wherein the superconductor is CuO.
を特徴とする特許請求の範囲第２項記載の化合物超電導
体の製造方法。(3) The method for producing a compound superconductor according to claim 2, wherein the powder has a purity of 99.9% or more.
１５００ｋｇ／ｃｍ＾２範囲であることを特徴とする特
許請求の範囲第１項記載の化合物超電導体の製造方法。(4) The pressure in the second and fifth steps is 3~
2. The method for producing a compound superconductor according to claim 1, wherein the weight is in the range of 1500 kg/cm^2.
．２気圧以上の雰囲気内で、９００〜１１００℃の範囲
に１時間以上保持した後、６００℃までは毎分１０℃以
下の降温速度で徐冷する経過を辿ることを特徴とする特
許請求の範囲第１項記載の化合物超電導体の製造方法。(5) In the heat treatment in the third step, the oxygen partial pressure is 0.
．． Claims characterized in that after being maintained at a temperature in the range of 900 to 1100°C for 1 hour or more in an atmosphere of 2 atmospheres or more, the temperature is gradually cooled down to 600°C at a temperature decreasing rate of 10°C or less per minute. 2. A method for producing a compound superconductor according to item 1.
．２気圧以上の雰囲気内で、９００〜１１００℃の範囲
に２０時間以上保持した後、６００℃までは毎分１０℃
以下の降温速度で徐冷する経過を辿ることを特徴とする
特許請求の範囲第１項記載の化合物超電導体の製造方法
。(6) In the heat treatment in the sixth step, the oxygen partial pressure is 0.
．． After being maintained in the range of 900 to 1100℃ for 20 hours or more in an atmosphere of 2 atmospheres or more, the temperature is 10℃ per minute up to 600℃.
2. The method for producing a compound superconductor according to claim 1, wherein the process of slow cooling is performed at the following temperature decreasing rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62056754A JPS63225524A (en) | 1987-03-13 | 1987-03-13 | Production of compound superconductive body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62056754A JPS63225524A (en) | 1987-03-13 | 1987-03-13 | Production of compound superconductive body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63225524A true JPS63225524A (en) | 1988-09-20 |
Family
ID=13036299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62056754A Pending JPS63225524A (en) | 1987-03-13 | 1987-03-13 | Production of compound superconductive body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63225524A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS643061A (en) * | 1987-03-22 | 1989-01-06 | Sumitomo Electric Ind Ltd | Production of superconducting material |
| JPS643063A (en) * | 1987-03-28 | 1989-01-06 | Sumitomo Electric Ind Ltd | Production of superconductive material |
| JPS6476950A (en) * | 1987-09-17 | 1989-03-23 | Mitsubishi Cable Ind Ltd | Production of superconducting substance |
| US5639714A (en) * | 1988-08-29 | 1997-06-17 | Sumitomo Electric Industries, Ltd. | Method of producing oxide superconductor |
-
1987
- 1987-03-13 JP JP62056754A patent/JPS63225524A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS643061A (en) * | 1987-03-22 | 1989-01-06 | Sumitomo Electric Ind Ltd | Production of superconducting material |
| JPS643063A (en) * | 1987-03-28 | 1989-01-06 | Sumitomo Electric Ind Ltd | Production of superconductive material |
| JPS6476950A (en) * | 1987-09-17 | 1989-03-23 | Mitsubishi Cable Ind Ltd | Production of superconducting substance |
| US5639714A (en) * | 1988-08-29 | 1997-06-17 | Sumitomo Electric Industries, Ltd. | Method of producing oxide superconductor |
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