JPH01145364A - Production of high-temperature superconducting ceramics - Google Patents
Production of high-temperature superconducting ceramicsInfo
- Publication number
- JPH01145364A JPH01145364A JP62301431A JP30143187A JPH01145364A JP H01145364 A JPH01145364 A JP H01145364A JP 62301431 A JP62301431 A JP 62301431A JP 30143187 A JP30143187 A JP 30143187A JP H01145364 A JPH01145364 A JP H01145364A
- Authority
- JP
- Japan
- Prior art keywords
- alkaline earth
- earth element
- oxide
- earth metal
- rare earth
- 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
- 239000000919 ceramic Substances 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 14
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
- 239000010949 copper Substances 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims description 15
- 150000001875 compounds Chemical class 0.000 claims description 11
- 150000002978 peroxides Chemical class 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 230000002950 deficient Effects 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000000843 powder Substances 0.000 abstract description 13
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 abstract description 6
- 238000005245 sintering Methods 0.000 abstract description 5
- 239000005751 Copper oxide Substances 0.000 abstract description 4
- 229910000431 copper oxide Inorganic materials 0.000 abstract description 4
- 229910052693 Europium Inorganic materials 0.000 abstract description 3
- 229910052772 Samarium Inorganic materials 0.000 abstract description 3
- -1 CuO) Chemical compound 0.000 abstract description 2
- 229910052692 Dysprosium Inorganic materials 0.000 abstract description 2
- 229910052688 Gadolinium Inorganic materials 0.000 abstract description 2
- 229910052689 Holmium Inorganic materials 0.000 abstract description 2
- 229910052779 Neodymium Inorganic materials 0.000 abstract description 2
- 229910052788 barium Inorganic materials 0.000 abstract description 2
- 239000011812 mixed powder Substances 0.000 abstract description 2
- 229910052706 scandium Inorganic materials 0.000 abstract description 2
- 229910052712 strontium Inorganic materials 0.000 abstract description 2
- 229910052727 yttrium Inorganic materials 0.000 abstract description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 abstract 3
- 150000001342 alkaline earth metals Chemical class 0.000 abstract 3
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 abstract 2
- 229910052746 lanthanum Inorganic materials 0.000 abstract 1
- 238000000034 method Methods 0.000 description 17
- 238000002156 mixing Methods 0.000 description 4
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910052691 Erbium Inorganic materials 0.000 description 2
- 229910020012 Nb—Ti Inorganic materials 0.000 description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 229910001281 superconducting alloy Inorganic materials 0.000 description 2
- 241000270728 Alligator Species 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 1
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium atom Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 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
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、高温超電導セラミックスの製造方法に関する
。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing high temperature superconducting ceramics.
（従来技術及びその問題点）
Ｙ−Ｂａ−Ｃｕ−０系に代表される稀土類元素−アルカ
リ土贋元素−銅の酸化物からなる成業欠損型層状ペロプ
スカイト構２造を有する高温超電導物質は、交通機関、
重電機器、コンビエータ−１医療機器の多方面への応用
が期待されている。(Prior art and its problems) A high-temperature superconducting material having a layered perovskite structure consisting of a rare earth element-alkaline earth element-copper oxide represented by the Y-Ba-Cu-0 system. is transportation,
It is expected that heavy electrical equipment and Combiator 1 medical equipment will be applied in many fields.
これらの酸化物系高温超電導セラミックスは、液体窒素
のような安価な冷媒で冷却することによっても超電導状
態になるため、液体ヘリウム中でしか超電導状態を示さ
ないＮｂ−Ｔｉ系超電導合金などの代わりに、超電導マ
グネットなどに使えれば、経済的に大きなメリットがあ
る。These oxide-based high-temperature superconducting ceramics also become superconducting when cooled with an inexpensive coolant such as liquid nitrogen, so they can be used instead of Nb-Ti-based superconducting alloys, which only exhibit superconducting state in liquid helium. If it can be used for things like superconducting magnets, it would have great economic benefits.
しかし、これまで作られてきた超電導セラミツ “
クスは臨界電流密度が数＋Ａ／ｃｄと低く、従来−般的
に使われてきたＮｂ−Ｔｉ系超電導合金の１／２００〜
１／４００に過ぎないという欠点があった。However, the superconducting ceramics that have been made so far “
The critical current density of carbon steel is as low as several + A/cd, which is 1/200 to 1/200 of that of conventionally commonly used Nb-Ti superconducting alloys.
The drawback was that it was only 1/400.
また、常電導〜超電導の転移の温度幅が広く急峻さに欠
けているという点も問題であった。Another problem was that the temperature range of the transition from normal conductivity to superconductivity was wide and lacked steepness.
これらの問題点の原因の一つとして、超電導セラミック
スが多孔質で密度が小さいことが指摘されている。It has been pointed out that one of the causes of these problems is that superconducting ceramics are porous and have a low density.
これまで稀土讃元素−アルカリ土頚元素−鰐酸化物系高
温超電導セラミ゛ツクスは、各々の元素の原料化合物と
して酸化物、水酸化物あるいは炭酸塩を用いて、乾式混
合法あるいは湿式混合法で調製した原料粉末を、加圧・
焼結して作られてきた。Hitherto, high-temperature superconducting ceramics based on rare earth elements, alkaline earth elements, and alligator oxides have been produced using oxides, hydroxides, or carbonates as raw material compounds of each element, using dry or wet mixing methods. The prepared raw material powder is pressurized and
It is made by sintering.
乾式混合法は、超電導セラミックスの構成成分の酸化物
あるいは炭酸塩の粉末、例えばＡ８０゜（Ａは稀土類元
素を示す）、ＢｅＯ２（Ｂはアルカリ土類元素を示す）
、ＣｕＯの粉末を出発原料として、ボールミル、措潰機
あるいは乳棒・乳鉢などで粉砕、混合した後に焼結して
、超電導セラミックスの原料粉末を調製す・る方法であ
る。The dry mixing method uses powders of oxides or carbonates that are constituent components of superconducting ceramics, such as A80° (A represents a rare earth element), BeO2 (B represents an alkaline earth element).
, CuO powder is used as a starting material, and the raw material powder for superconducting ceramics is prepared by pulverizing and mixing in a ball mill, crusher, pestle, mortar, etc., and then sintering.
一方、湿式混合法は、乾式法と同様の出発原料に、出発
原料と反応せずかつこれを実質的に溶解しない溶媒を加
えて、機械的に混合する方法である。On the other hand, the wet mixing method is a method in which a solvent that does not react with and does not substantially dissolve the starting materials is added to the same starting materials as in the dry method, and the mixture is mechanically mixed.
以上いずれの方法を用いて超電導セラミックスの原料粉
末を調製しても、これらを成形、焼結して超電導セラミ
ックスにしたとき、臨界温度が低く、臨界電流密度も小
さいことが問題になっている。No matter which of the above methods is used to prepare raw material powders for superconducting ceramics, there are problems in that when they are molded and sintered to form superconducting ceramics, the critical temperature is low and the critical current density is also low.
（問題点解決のための技術的手段）
本発明者等は、主として稀土類元素−アルカリ土類元素
−銅の酸化物からなる酸素欠損型層状ペロプスカイト構
造を有する高温超電導セラミックスを製造する際に、少
なくとも一部のアルカリ土類元素の原料化合物としてア
ルカリ土類元素の過酸化物を用いることにより、上記問
題点が解決出来ることを見出した。(Technical means for solving the problem) The present inventors have developed a method for producing high-temperature superconducting ceramics having an oxygen-deficient layered perovskite structure mainly consisting of rare earth element-alkaline earth element-copper oxides. It has been found that the above problems can be solved by using a peroxide of an alkaline earth element as a raw material compound for at least a part of the alkaline earth element.
本発明の高温超電導セラミックスの原料粉末の調製法に
ついて以下に説明する。。A method for preparing raw material powder for high temperature superconducting ceramics of the present invention will be described below. .
まず、本発明における稀土類元素−アルカリ土類元素−
銅の酸化物系高温超電導セラミックスは、次の一般式、
ＡｘＢｙＣｕ３０７−ｚで表され、式中ＡはＳｃ、Ｙ、
Ｌａ、、Ｎｄ５５ｍ、Ｅｕ、Ｇｄ。First, rare earth elements in the present invention - alkaline earth elements -
Copper oxide-based high-temperature superconducting ceramics have the following general formula:
It is represented by AxByCu307-z, where A is Sc, Y,
La,, Nd55m, Eu, Gd.
Ｄｙ、Ｈｏ及びＥｒから選択される少なくとも一種類の
稀土類元素、ＢはＳｒ及びＢａから選択される少なくと
も一種顕のアルカリ土類元素を示し、Ｘは０．８より大
きく、１．２より小さく、Ｙは１．６より大きく、２．
４より小さい数値である。at least one kind of rare earth element selected from Dy, Ho and Er; B represents at least one kind of alkaline earth element selected from Sr and Ba; X is larger than 0.8 and smaller than 1.2; , Y is greater than 1.6, 2.
It is a numerical value smaller than 4.
また本発明における高温超電導セラミックスは、上記−
毀式中の銅の一部を最大５０％まで他の金属、例えばＶ
、ＺｒＳＮｂＳＭｏ％ＨＥＳＴａ。Further, the high temperature superconducting ceramics in the present invention include the above-
Up to 50% of the copper in the process can be replaced with other metals, such as V
, ZrSNbSMo%HESTa.
’ｗ、ｐｂあるいはＢｉで置換されたものも含んでいる
。'w, pb or Bi substitutions are also included.
本発明においては、前記の一般式で表される高温超電導
セラミックスの原料粉末を製造する際に、稀土類元素及
び銅の原料化合物として、稀土類元素及び銅の酸化物、
アルカリ土類元素の原料化合物として、アルカリ土類元
素の過酸化物と酸化物の混合物を用いる。In the present invention, when producing raw material powder for high temperature superconducting ceramics represented by the above general formula, rare earth elements and copper oxides,
As the raw material compound of the alkaline earth element, a mixture of peroxide and oxide of the alkaline earth element is used.
アルカリ土類元素の原料化合物中におけるアルカリ土類
元素の過酸化物の割合は、５モル％以上であることが好
ましい０例えばアルカリ土類元素がＢａの場合、原料化
合物としてのＢａＯまたは、ＢａＣ０，０５モル％以上
を、Ｂａｄ、に置換する。置換するアルカリ土類元素の
過酸化物の割合が、５モル％より小さいときは、超電導
特性の向上効果が現れない。The proportion of the peroxide of the alkaline earth element in the raw material compound of the alkaline earth element is preferably 5 mol% or more. For example, when the alkaline earth element is Ba, BaO or BaC0, 05 mol% or more is replaced with Bad. When the proportion of the peroxide of the substituted alkaline earth element is less than 5 mol %, the effect of improving the superconducting properties does not appear.
高温超電導セラミックス成分元素の各々の原料化合物を
混合粉砕する方法としては、乾式、湿式法いずれでも良
いが、工業的規模で大量混合粉砕する場合は、湿式法が
操作上安全で好ましい。The raw material compounds of the high-temperature superconducting ceramic component elements may be mixed and pulverized using either a dry method or a wet method, but when mixing and pulverizing on a large scale on an industrial scale, the wet method is preferred because it is operationally safe.
混合粉砕された原料粉末を、７００〜９５０℃で仮焼成
し、この焼成粉末を通常知られた方法で成形した後、７
５０〜９５０℃で焼結させて、高温超電導セラミックス
焼結体が得られる。混合粉砕された原料粉末を、仮焼成
せずにそのまま成形した後焼結させても、高温超電導セ
ラミックス焼結体が得られる。The mixed and pulverized raw material powder is calcined at 700 to 950°C, and the calcined powder is molded by a commonly known method.
A high-temperature superconducting ceramic sintered body is obtained by sintering at 50 to 950°C. A high-temperature superconducting ceramic sintered body can be obtained even if the mixed and pulverized raw material powders are shaped as they are without being pre-fired and then sintered.
（実施例） 以下に本発明の実施例を示す。(Example) Examples of the present invention are shown below.
実施例１
酸化イツトリウム（Ｙ意０３）０．５モル、ＢａＯ□０
．５モル、ＢａＣＯ５１，５モル及びＣｕＯ３モルの粉
末をらいかい器を用いて乾式混合した。この混合粉末を
空気中で８２０″Ｃ１２時間仮焼成した。この粉末を１
ｔ ／ｃｄの圧力で成形し、これを９００’Ｃで６時
間加熱して高温超電導セラミックス焼結体を得た。Example 1 Yttrium oxide (Yi03) 0.5 mol, BaO□0
．． Powders of 5 mol, BaCO5 1.5 mol and CuO 3 mol were dry mixed using a sieve. This mixed powder was calcined in air at 820"C for 12 hours. This powder was
It was molded at a pressure of t/cd and heated at 900'C for 6 hours to obtain a high-temperature superconducting ceramic sintered body.
得られた超電導セラミックス焼結体の臨界温度、臨界電
流密度は下記の通りであった。The critical temperature and critical current density of the obtained superconducting ceramic sintered body were as follows.
臨界温度 ９５ Ｋ
臨界電流回度 ３２５ Ａ／Ｃ１１１実施例２
アルカリ土類元素の原、糾化合物として、ＢａＯ□１モ
ル、ＢａＣＯ３１モルを用いた以外は、実施例１と同様
に行った。Critical temperature: 95 K Critical current: 325 A/C111 Example 2 The same procedure as in Example 1 was carried out except that 1 mole of BaO□ and 1 mole of BaCO were used as the source of the alkaline earth element and the condensation compound.
得られた超電導セラミックス焼結体の臨界温度、臨界電
流密度は下記の通りであった。The critical temperature and critical current density of the obtained superconducting ceramic sintered body were as follows.
臨界温度 ・ ９６ Ｋ
臨界電流密度 ３２８ Ａ／ｃ−ｄ
実施例３
アルカリ土類元素の原料化合物として、Ｂａ０゜２モル
を用いた以外は、実施例１と同様に行った。Critical temperature: 96 K Critical current density: 328 A/c-d Example 3 The same procedure as in Example 1 was conducted except that 0.2 mol of Ba was used as the raw material compound for the alkaline earth element.
得られた超電導セラミックス焼結体の臨界温度、臨界電
流密度は下記の通りであった。The critical temperature and critical current density of the obtained superconducting ceramic sintered body were as follows.
臨界温度 ９６ Ｋ
臨界電流回度 ３３０ Ａ／ｃｄ
実施例４〜７
希土類元素の化合物として酸化イツトリウムの代わりに
ネオジウム、エルビウム、サマリウムあるいはユーロピ
ウムの酸化物を用いた以外は、実施例３と同様に行った
。Critical temperature: 96 K Critical current speed: 330 A/cd Examples 4 to 7 The same procedure as in Example 3 was carried out except that oxides of neodymium, erbium, samarium, or europium were used instead of yttrium oxide as the rare earth element compound. Ta.
得られた超電導セラミックス焼結体の臨界温度、臨界電
流密度は下記の通りであった。The critical temperature and critical current density of the obtained superconducting ceramic sintered body were as follows.
実施例 希土類 臨界 臨界電流番号 元素化
合物 温度 密度
Ｋ Ａ／ａＪ
４ ＮｄｚＯａ ９３ ３１７ｓ Ｅ
ｒａ’ｓ ９ｓ ３２Ｂ６ Ｓｍ、Ｏｓ
９４ ３１５７ ＥｕｚＯｓ ９
３ ３１６比較例１
アルカリ土類元素の原料化合物として、ＢａＣＯ５２モ
ルを用いた以外は、実施例１と同様に行った。Examples Rare earth Critical Critical current number Element compound Temperature Density K A/aJ 4 NdzOa 93 317s E
ra's 9s 32B6 Sm, Os
94 3157 EuzOs 9
3 316 Comparative Example 1 The same procedure as in Example 1 was carried out except that 52 mol of BaCO was used as the raw material compound of the alkaline earth element.
得られた超電導セラミックス焼結体の臨界温度、臨界電
流密度は下記の通りであった。The critical temperature and critical current density of the obtained superconducting ceramic sintered body were as follows.
臨界温度 ９１ Ｋ 臨界電流密度 ２７１ Ａ／ｄ 特許出願人 宇部興産株式会社Critical temperature 91 K Critical current density 271 A/d Patent applicant: Ube Industries Co., Ltd.
Claims (1)
からなる酸素欠損型層状ペロブスカイト構造を有する高
温超電導セラミックスを製造する際に、少なくとも一部
のアルカリ土類元素の原料化合物としてアルカリ土類元
素の過酸化物を用いることを特徴とする高温超電導セラ
ミックスの製造方法。When producing high-temperature superconducting ceramics having an oxygen-deficient layered perovskite structure mainly consisting of rare earth element-alkaline earth element-copper oxides, an alkaline earth element is used as a raw material compound of at least a part of the alkaline earth element. A method for producing high-temperature superconducting ceramics, characterized by using peroxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62301431A JPH01145364A (en) | 1987-12-01 | 1987-12-01 | Production of high-temperature superconducting ceramics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62301431A JPH01145364A (en) | 1987-12-01 | 1987-12-01 | Production of high-temperature superconducting ceramics |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01145364A true JPH01145364A (en) | 1989-06-07 |
Family
ID=17896799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62301431A Pending JPH01145364A (en) | 1987-12-01 | 1987-12-01 | Production of high-temperature superconducting ceramics |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01145364A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02149423A (en) * | 1988-12-01 | 1990-06-08 | Dowa Mining Co Ltd | Production of oxide superconducting powder |
| CN102276255A (en) * | 2011-06-02 | 2011-12-14 | 西北工业大学 | Preparation method for sheet-like barium titanate microcrystalline powder |
| CN102834879A (en) * | 2010-04-26 | 2012-12-19 | 株式会社藤仓 | Oxide superconducting conductor and production method therefor |
-
1987
- 1987-12-01 JP JP62301431A patent/JPH01145364A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02149423A (en) * | 1988-12-01 | 1990-06-08 | Dowa Mining Co Ltd | Production of oxide superconducting powder |
| CN102834879A (en) * | 2010-04-26 | 2012-12-19 | 株式会社藤仓 | Oxide superconducting conductor and production method therefor |
| US8772201B2 (en) | 2010-04-26 | 2014-07-08 | Fujikura Ltd. | Oxide superconducting conductor and method of manufacturing the same |
| CN102276255A (en) * | 2011-06-02 | 2011-12-14 | 西北工业大学 | Preparation method for sheet-like barium titanate microcrystalline powder |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0305179A1 (en) | Melt-produced high temperature superconductor | |
| AU604827B2 (en) | New superconductive compounds of the k2nif4 structural type having a high transition temperature, and method for fabricating same | |
| JP2571789B2 (en) | Superconducting material and its manufacturing method | |
| JP2533108B2 (en) | Superconducting material | |
| JPH01145364A (en) | Production of high-temperature superconducting ceramics | |
| JPH01138132A (en) | Meltable superconductor and its production | |
| JPH01264954A (en) | Production of high-temperature superconductor | |
| KR910001306B1 (en) | Superconductive compound of k2nif4 structural type having high transition temperature and method for fabricating same | |
| JP2709380B2 (en) | How to make a superconducting magnet | |
| JP2597578B2 (en) | Superconductor manufacturing method | |
| JPS63315566A (en) | Perovskite type oxide superconducting material having high jc and tc | |
| CN1031620A (en) | New superconductive compound and preparation method thereof with ni-type structure of potassium fluoride of high transition temperature | |
| JP2585621B2 (en) | How to make superconducting material | |
| Suresha et al. | High temperature superconductivity in Y-Ba-Cu-Nb-O system | |
| JPH01264955A (en) | Production of high-temperature superconductor | |
| JP2859283B2 (en) | Oxide superconductor | |
| JP2597579B2 (en) | Superconductor manufacturing method | |
| JPH0569059B2 (en) | ||
| JP2590370B2 (en) | Superconducting material and manufacturing method thereof | |
| JPH01224259A (en) | Production of high-temperature superconducting ceramics | |
| JPH0446015A (en) | Oxide superconducting material and its production | |
| Hermann et al. | Melt-produced high temperature superconductor | |
| JPH0222128A (en) | Production of raw material powder for high-temperature superconductor | |
| JPS63233067A (en) | Preparation of superconductive ceramic | |
| JPH01224258A (en) | Production of high-temperature superconducting ceramics |