JPH01305846A - Production of oxide superconductor - Google Patents
Production of oxide superconductorInfo
- Publication number
- JPH01305846A JPH01305846A JP63135655A JP13565588A JPH01305846A JP H01305846 A JPH01305846 A JP H01305846A JP 63135655 A JP63135655 A JP 63135655A JP 13565588 A JP13565588 A JP 13565588A JP H01305846 A JPH01305846 A JP H01305846A
- Authority
- JP
- Japan
- Prior art keywords
- oxide superconductor
- composition
- orientation
- starting material
- pressure
- 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
- 238000004519 manufacturing process Methods 0.000 title claims 2
- 239000002887 superconductor Substances 0.000 title abstract description 7
- 239000000843 powder Substances 0.000 claims abstract description 15
- 239000007858 starting material Substances 0.000 claims abstract description 6
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims abstract description 5
- 150000001342 alkaline earth metals Chemical class 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 229910052747 lanthanoid Inorganic materials 0.000 claims abstract description 5
- 150000002602 lanthanoids Chemical class 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims abstract description 4
- 229910002480 Cu-O Inorganic materials 0.000 claims abstract 3
- 238000005245 sintering Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 2
- 239000000203 mixture Substances 0.000 abstract description 30
- 239000000523 sample Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 7
- 238000002441 X-ray diffraction Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 238000000465 moulding Methods 0.000 description 5
- 239000008188 pellet Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- 150000004703 alkoxides Chemical class 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- -1 barium alkoxide Chemical class 0.000 description 2
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 229910052727 yttrium Inorganic materials 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-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
- Inorganic Compounds Of Heavy Metals (AREA)
- Superconductor Devices And Manufacturing Methods Thereof (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、一定方向にＣ＠をそろえた超伝導酸化物体を
形成する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for forming a superconducting oxide body in which C@ is aligned in a certain direction.
［従来の技術］
高い臨界温度（Ｔｃ）を有する超伝導酸化物材料系とし
てＬｎ−＾ｅ−Ｃｕ−０系（Ｌｎはランタノイドの少な
くとも１種、八〇はアルカリ土類金属の少なくとも１ｆ
ｆｌ）が知られている。[Prior art] As a superconducting oxide material system having a high critical temperature (Tc), Ln-^e-Cu-0 system (Ln is at least one kind of lanthanide, 80 is at least 1f of alkaline earth metal)
fl) is known.
超伝導体を実用に供するためには、臨界電流密度や臨界
磁場が大きな値をとれることが重要であり、そのために
は、単結晶体であることが最も望ましい。しかし、望む
形状のしかも大形の単結晶を得ることは大変困難であり
、そのため、超伝導を示す結晶相を特定の方向（ｃ ９
４方向）にそろえることが試みられた。In order to put a superconductor into practical use, it is important that the critical current density and critical magnetic field can take large values, and for this purpose, a single crystal is most desirable. However, it is very difficult to obtain a large single crystal with the desired shape, and therefore it is difficult to obtain a crystal phase that exhibits superconductivity in a specific direction (c 9
Attempts were made to align them in four directions.
例えば、電流はａ、ｂ軸方向によりよく流れることが知
られており、Ｃ＠を一定方向にそろえ、Ｃ釉に垂直な方
向に電流を流すことにより臨界電流密度も向上する。１
−２−３組成（ＹＢ、１２ｃ１４３０Ｘ超伝導相）から
なる微粉体をベレットに作製したとき、Ｃ＠配向が観察
された例はあるが、Ｃ軸配向を実現するための効果的な
方法は報告されていない。For example, it is known that current flows better in the a- and b-axis directions, and by aligning C@ in a certain direction and flowing current in a direction perpendicular to C glaze, the critical current density can also be improved. 1
-2-3 When fine powder with the composition (YB, 12c1430X superconducting phase) was made into a pellet, there is an example in which C@ orientation was observed, but no effective method to achieve C-axis orientation has been reported. It has not been.
一方、本発明者らは特願昭６３−２５６０５号にお５）
て、基板上に膜を形成する場合、Ｌｎ−Ｂａ−Ｃｕ−０
系において１：２：３組成（ＹＢａｉ［：ｕ、Ｏｘ ）
からずれ、Ｃｕが比較的多く、Ｌｎが少ない組成を選択
することにより、配向度の優れた膜を形成すること、さ
らに、アルコキシドを出発原料にして、粒径の小さな微
粒子から作製することにより、優れたＣ軸配向度が実現
できることを明らかにしてきた。On the other hand, the present inventors have disclosed in Japanese Patent Application No. 63-25605 (5)
When forming a film on a substrate, Ln-Ba-Cu-0
1:2:3 composition (YBai[:u,Ox) in the system
By selecting a composition with a relatively high content of Cu and low content of Ln, a film with an excellent degree of orientation can be formed.Furthermore, by using alkoxide as a starting material and producing fine particles with a small particle size, It has been revealed that an excellent degree of C-axis orientation can be achieved.
［発明が解決しようとする課題］
種々の応用を考える時、膜だけでなくもちろんバルク形
状においても特定方向にＣ軸配向された超伝導酸化物体
が望ましく配向度もよりすぐれたものが望まれている。[Problems to be solved by the invention] When considering various applications, it is desirable to have a superconducting oxide whose C-axis is oriented in a specific direction, not only in the film but also in the bulk shape, and one with a better degree of orientation. There is.
本発明は、ＬローＡｅ−Ｃｕ−０系において、強くＣ軸
配向したバルク状の酸化物超伝導体を実現する方法を提
供することを目的とする。An object of the present invention is to provide a method for realizing a bulk oxide superconductor with strong C-axis orientation in the L-low Ae-Cu-0 system.
［課題を解決するための手段１
このような目的を達成するため、本発明は、Ｌｎ−Ａｅ
−Ｃｕ−０系（ただし、Ｌｎはランタノイドの少なくと
も１種、 Ａｅはアルカリ土類金属の少なくとも１種）
超伝導酸化物体において、Ｌｎ、ＡｅおよびＣｕの化合
物をＬｎ／ （Ｌｎ＋Ａｅ＋Ｃｕ） ＜ １６．６モル
％。[Means for Solving the Problems 1 In order to achieve such an object, the present invention provides Ln-Ae
-Cu-0 system (Ln is at least one kind of lanthanoid, Ae is at least one kind of alkaline earth metal)
In superconducting oxide bodies, the compound of Ln, Ae and Cu is Ln/(Ln+Ae+Cu) < 16.6 mol%.
Ｃｕ／ （Ｌｎ＋Ａｅ＋（：ｕ） ＞ ５０モル％およ
び残部Ａｅのそル比で含む微粉体からなる出発原料を焼
結して超伝導相を出現せしめる工程と、焼結した焼結体
を微粉体にする工程と、微粉体に特定の方向から圧力を
加えて形成する工程とを含む。A process of sintering a starting material consisting of a fine powder containing Cu/(Ln+Ae+(:u) > 50 mol% and the balance Ae in the same ratio as above to make a superconducting phase appear, and sintering the sintered body into a fine powder. and a step of applying pressure to the fine powder from a specific direction to form it.
［作 用］
本発明においては、配向しやすい出発組成を適用するこ
とにより、焼結粉体中には、圧力によって一方向に並び
やすい板状結晶が多く含有されており、その後の圧力成
形によっても優れた配向度をもつバルク状サンプルを得
ることができる。[Function] In the present invention, by applying a starting composition that is easy to orient, the sintered powder contains many plate-like crystals that are easy to align in one direction due to pressure, and are easily oriented in one direction by pressure forming. It is also possible to obtain bulk samples with an excellent degree of orientation.
第１図にこの様子を模式的・に示す。ａ、ｂおよびＣ軸
（ａ ＝ ３．８１８Ａ、 ｂ ＝ ３．８８８八、
ｃ ＝ １１．６６８Ａ）からなるユニットセル１が板
状の結晶２を構成するため、圧力に対してより安定する
方向に並ぶものと考えられる。Figure 1 schematically shows this situation. a, b and C axes (a = 3.818A, b = 3.888A,
c = 11.668A) constitutes the plate-shaped crystal 2, so it is thought that they are arranged in a direction that is more stable against pressure.
〔実施例］ 以下、実施例によって本発明の詳細な説明する。〔Example] Hereinafter, the present invention will be explained in detail with reference to Examples.
ゑ」し吐土
ｙ、ｏ、、 ＢａＣＯ３，（：ｕＯをＹ：Ｂａ：Ｃｕ−
１：２：３となる組成（１−２−３組成と呼ぶ） （
Ｙ−１６，７モル％、 Ｂａ−３３，３モル％、 Ｃｕ
−５０モル％）と、Ｙ−８モル％、 Ｂａ−３０モル％
、 Ｃｕ＝６２モル％からなる組成（配向組成と呼ぶ）
の２種類の組成比に混合し、酸素雰囲気下において９５
０℃で５時間予備焼結を行った。これらを粉砕して粉体
を作製し、それぞれＸ線回折パターンを測定した。ゑゑゑゑ and deposit y, o, BaCO3, (:uO to Y:Ba:Cu-
A composition with a ratio of 1:2:3 (referred to as a 1-2-3 composition) (
Y-16.7 mol%, Ba-33.3 mol%, Cu
-50 mol%), Y-8 mol%, Ba-30 mol%
, a composition consisting of Cu=62 mol% (referred to as an oriented composition)
95% in an oxygen atmosphere.
Preliminary sintering was performed at 0°C for 5 hours. These were pulverized to produce powders, and the X-ray diffraction patterns of each powder were measured.
第２図に、配向組成および１−２−３組成のＸ線回折パ
ターンを示す。（ＯＯＮ）のピーク（Ｎは整数）とその
他のピーク、例えば（１１０）および（１１３）ピーク
とを比較するとそのＣ軸配向の程度がわかる。ピーク比
Ｒ＝ （００６） ／ （１１０） （１１３）を求め
ると、配向組成ではＲ＝ １．０６．１−２−３組成で
は、Ｒ＝ ０．５２となる。FIG. 2 shows the X-ray diffraction patterns of the oriented composition and the 1-2-3 composition. Comparing the (OON) peak (N is an integer) with other peaks, such as (110) and (113) peaks, reveals the degree of C-axis orientation. When the peak ratio R = (006) / (110) (113) is determined, R = 1.06 for the oriented composition, and R = 0.52 for the 1-2-3 composition.
この２種類の組成粉末（９５０℃焼結後）を用い、第３
図に示すようにシリンダー３に加え′る圧力を変えてベ
レット４を作製し、Ｘ線回折の測定を行った。圧力は第
１図に示したＣ軸に平行な方向にかけられる。第４図に
、これらのベレットサンプルの配向度（（ＯＯａ）と（
１１０） （１１３）のピーク比で評価した）を成形圧
力に対して示す。曲線Ａは配向組成、曲線Ｂは１−２−
３組成のサンプルのそれぞれのピーク比を示す。配向組
成のサンプルの方がより強く配向することがわかる。Using these two types of composition powders (after sintering at 950°C), the third
As shown in the figure, pellets 4 were prepared by varying the pressure applied to the cylinder 3, and X-ray diffraction measurements were performed. Pressure is applied in a direction parallel to the C axis shown in FIG. Figure 4 shows the degree of orientation ((OOa) and (
110) (evaluated by the peak ratio of (113)) is shown against molding pressure. Curve A is the orientation composition, curve B is the 1-2-
The peak ratios of samples with three compositions are shown. It can be seen that the sample with the oriented composition is more strongly oriented.
実施例２
Ｙ：Ｂａ：（：ｕの組成比を変えて圧力によって配向し
やすい組成の探索を行った。焼結条件は、実施例１と同
様に、酸素雰囲気下で９５０℃とし、圧力は１９０００
ｋｇ／ｃｍ２でベレット作製を行った。第５図に結果を
示す。配向組成に匹敵する配向度が得られたものはＯ印
で、１−２−３ ｉ成程度またはそれ以下の配向度のも
のは・印で三角ダイヤグラム中に示す。０印で示す組成
範囲は、本発明者らが、特願昭６３−２５６０５号に示
した膜の場合の配向組成とほぼ一致し、ｙ／ （Ｙ＋Ｂ
ａ＋Ｃｕ） ＜ １６．６モル％、Ｃｕ／（Ｙ＋Ｂａ＋
Ｃｕ） ＞ ５０モル％となった。Example 2 By changing the composition ratio of Y: Ba: 19000
A pellet was made at kg/cm2. The results are shown in Figure 5. Those with an orientation degree comparable to the orientation composition are indicated by O, and those with an orientation degree of 1-2-3 i or less are indicated by . in the triangular diagram. The composition range indicated by the 0 mark almost coincides with the orientation composition of the film shown in Japanese Patent Application No. 63-25605 by the present inventors, and is y/(Y+B
a+Cu) < 16.6 mol%, Cu/(Y+Ba+
Cu)>50 mol%.
１履」旦
１−２−３組成および配向組成の２ ｆ！！＋類につき
、加圧成形後、再度８７５℃４０時間大気中において焼
結を行い、配向度の変化をＸ線回折で調べた。第６図に
１−２−３組成サンプルの（ｏｏａ） ／ （１１０）
（１１３）のピーク比の圧力依存性の結果を示す。曲
線Ｃは加圧成形のみのサンプル、曲線りは加圧成形後、
再度８７５℃で焼結したサンプルの配向度を示す。特に
再焼結によって配向度が減少することは見られなかった
。配向組成については、図示しないが、同様の傾向が畢
られている。1-2-3 composition and orientation composition 2 f! ! For the + class, after pressure molding, sintering was performed again in the atmosphere at 875° C. for 40 hours, and changes in the degree of orientation were examined by X-ray diffraction. Figure 6 shows (ooa) / (110) of the 1-2-3 composition sample.
The results of the pressure dependence of the peak ratio of (113) are shown. Curve C is a sample with pressure molding only, the curve is after pressure molding,
The degree of orientation of the sample sintered at 875° C. is shown again. In particular, no decrease in the degree of orientation was observed due to resintering. Regarding the orientation composition, although not shown, a similar tendency is observed.
再焼結を行ったベレット形状サンプルの抵抗の温度特性
を四端子法で測定したところ９３にでオンセット（抵抗
か急激に減少を開始する温度）、９０にで零抵抗となり
、転移幅３にの値が得られた。When the temperature characteristics of the resistance of the resintered pellet-shaped sample were measured using the four-probe method, the onset was at 93 (the temperature at which the resistance begins to decrease rapidly), the resistance was zero at 90, and the transition width was 3. The value of was obtained.
本実施例においては、加圧成形後に再焼結を行って固形
体としたが、これは超伝導特性を測定するためである。In this example, a solid body was obtained by re-sintering after pressure molding, and this was for the purpose of measuring superconducting properties.
λ屋旦ユ
酸化物を形成した時、Ｃｕ−６０，Ｂａ＝３０およびｙ
−ｉ。When forming λ Yatan oxide, Cu-60, Ba=30 and y
-i.
モル％の割合になるようにＧｕのアルコキシドＣｕ （
ｉ−ＯＣ３１１，） 、のｉ−プロパツール溶液、バリ
ウムのアルコキシドＢａ （ｎ−ＯＣ４１（ｇ）２％イ
ツトリウムのアルコキシドＹ （ｎ−ＯＣＪ９） ｓ
、の各ｎ−ブタノール溶液を混合した。Gu alkoxide Cu (
i-OC311,), i-propertool solution, barium alkoxide Ba (n-OC41 (g) 2% yttrium alkoxide Y (n-OCJ9) s
, n-butanol solutions were mixed.
この混合溶液を２０時間還流後、１０℃において、超音
波振動を加えながらＣｕ、ＢａおよびＹ総モルユに対し
て約５〜２０倍の純水を滴下して加え、さらにその後、
加水分解を十分に行わせるため、再度約１０時間還流を
行った。この溶液を１２０−１５０℃で約２〜３日加熱
して乾燥し、これを酸素７囲気下、 ９００℃で５時間
焼結した。After refluxing this mixed solution for 20 hours, at 10°C, while applying ultrasonic vibration, pure water in an amount of about 5 to 20 times the total amount of Cu, Ba, and Y was added dropwise, and then,
Refluxing was performed again for about 10 hours to ensure sufficient hydrolysis. This solution was dried by heating at 120-150°C for about 2-3 days, and then sintered at 900°C for 5 hours under 7 atmospheres of oxygen.
焼結したサンプルを粉砕後、板状のサンプル保持板と加
圧板との間に挟み、加圧板に垂直方向から圧力を加えて
保持板上に粉末を付着させ、Ｘ線回折を測定した。その
結果、Ｃ＠配向の傾向が見られ、Ｒ＝ （００６） ／
（１１０） （１１３） ＝ １．５５〜４の値が得
られた。これは、通常の市販粉末から作製した配向組成
のサンプルのＲ値＝１．０６より、さらに大きな配向度
を示すものである。After pulverizing the sintered sample, it was sandwiched between a plate-shaped sample holding plate and a pressure plate, pressure was applied to the pressure plate from the vertical direction to adhere the powder onto the holding plate, and X-ray diffraction was measured. As a result, a tendency toward C@ orientation was observed, with R= (006) /
Values of (110) (113) = 1.55 to 4 were obtained. This shows an even greater degree of orientation than the R value of 1.06 for a sample with an oriented composition prepared from a normal commercially available powder.
第７図にこのようにして得られたＲ＝４のサンプルのＸ
線回折パターンを示す。Figure 7 shows the X of the sample with R=4 obtained in this way.
The line diffraction pattern is shown.
［発明の効果］
以上説明したように、Ｃｕ＞５０モル％、 Ｌｎ＜ １
６．６モル％の組成を有るＬローＡｅ−Ｃｕ−０系（Ｌ
ｎはランタノイド、Ａｅはアルカリ土類金属）酸化物材
料を焼結して超伝導相を析出せしめ、粉砕し、特定方向
から加圧して形成体を作製することにより、ｃ釉が強く
特定方向にそろった超伏浮体を得ることができる。[Effect of the invention] As explained above, Cu>50 mol%, Ln<1
L-low Ae-Cu-0 system (L
n is a lanthanoid, Ae is an alkaline earth metal) oxide material is sintered to precipitate a superconducting phase, crushed, and pressurized from a specific direction to create a formed body. You can get a complete super floating body.
第１図は加圧することによってＣ＠配向することを模式
的に示す原理図、
第２図は配向組成および１’−２−３組成の粉末サンプ
ルのＸ線回折パターンを示す図、
第３図はＣ軸配向のための加圧方向を示す図、
第４図は加圧形成サンプルのＣ軸配向度と加えた圧力の
関係を示す図、
第５図はＣ軸配向しやすい組成を示す図、第６図は１−
２−３組成サンプルの加圧形成後、および加圧成形−再
焼結後のＣ＠配向度と加えた圧力の関係を示す図、
第７図はアルコキシドを原料にして作製した粉末サンプ
ルのＸ線回折パターンを示す図である。
特許出願人 日木電信電話株式会社
代理人 弁理士 谷 義 −
圧力
Ｃ７申Ｅ１３百乙匈 を木火人台勺に示１［図第１図
圧力
１＼勇δヨ月 〃ツじ７１３４列 Ｅ；＃ｌす、る 力
ロ刀ヨつｆ旬を力（１１βｎ第３図Figure 1 is a diagram schematically showing the principle of C@ orientation by applying pressure, Figure 2 is a diagram showing the orientation composition and the X-ray diffraction pattern of a powder sample with a 1'-2-3 composition, Figure 3 Figure 4 is a diagram showing the direction of pressure applied for C-axis orientation, Figure 4 is a diagram showing the relationship between the degree of C-axis orientation of a pressure-formed sample and the applied pressure, and Figure 5 is a diagram showing compositions that tend to have C-axis orientation. , Figure 6 is 1-
2-3 A diagram showing the relationship between C@ orientation degree and applied pressure after pressure forming and after pressure forming and resintering of composition samples. It is a figure showing a line diffraction pattern. Patent Applicant: Japan Telegraph and Telephone Co., Ltd. Agent, Patent Attorney Yoshi Tani - Pressure C7, E13, 1,000 匈 is shown in the 1 [Fig. ＃lsu、ru Power of power (11βnFigure 3)
Claims (1)
ノイドの少なくとも１種、Ａｅはアルカリ土類金属の少
なくとも１種）超伝導酸化物体において、 Ｌｎ、ＡｅおよびＣｕの化合物をＬｎ／（Ｌｎ＋Ａｅ＋
Ｃｕ）＜１６．６モル％、Ｃｕ／（Ｌｎ＋Ａｅ＋Ｃｕ）
＞５０モル％および残部Ａｅのモル比で含む微粉体から
なる出発原料を焼結して超伝導相を出現せしめる工程と
、前記焼結した焼結体を微粉体にする工程と、該微粉体
に特定の方向から圧力を加えて形成する工程とを含むこ
とを特徴とする超伝導酸化物体の製造方法。(1) In the Ln-Ae-Cu-O system (where Ln is at least one kind of lanthanoid and Ae is at least one kind of alkaline earth metal) superconducting oxide, a compound of Ln, Ae, and Cu is formed by combining Ln/( Ln+Ae+
Cu)<16.6 mol%, Cu/(Ln+Ae+Cu)
A step of sintering a starting material consisting of a fine powder containing a molar ratio of >50 mol% and the remainder Ae to make a superconducting phase appear; a step of turning the sintered body into a fine powder; and a step of turning the sintered body into a fine powder; 1. A method for producing a superconducting oxide object, the method comprising: applying pressure from a specific direction to form a superconducting oxide object.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63135655A JPH01305846A (en) | 1988-06-03 | 1988-06-03 | Production of oxide superconductor |
| EP88905427A EP0486686B2 (en) | 1987-06-17 | 1988-06-16 | Process for producing oxide superconductors |
| US07/313,965 US5294599A (en) | 1987-06-17 | 1988-06-16 | Processes for preparing oxide powders and superconducting oxides |
| DE3854400T DE3854400T3 (en) | 1987-06-17 | 1988-06-16 | METHOD FOR PRODUCING SUPRAL-CONDUCTING OXYDES. |
| PCT/JP1988/000585 WO1988010233A1 (en) | 1987-06-17 | 1988-06-16 | Process for producing oxide powder and oxide superconductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63135655A JPH01305846A (en) | 1988-06-03 | 1988-06-03 | Production of oxide superconductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01305846A true JPH01305846A (en) | 1989-12-11 |
Family
ID=15156860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63135655A Pending JPH01305846A (en) | 1987-06-17 | 1988-06-03 | Production of oxide superconductor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01305846A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5646097A (en) * | 1994-12-27 | 1997-07-08 | General Electric Company | Method of fabricating a (1223) Tl-Ba-Ca-Cu-O superconductor |
-
1988
- 1988-06-03 JP JP63135655A patent/JPH01305846A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5646097A (en) * | 1994-12-27 | 1997-07-08 | General Electric Company | Method of fabricating a (1223) Tl-Ba-Ca-Cu-O superconductor |
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