JPH01282124A - Production of powder of tinfinity-ca-ba-cu-o type superconducting oxide - Google Patents
Production of powder of tinfinity-ca-ba-cu-o type superconducting oxideInfo
- Publication number
- JPH01282124A JPH01282124A JP63111786A JP11178688A JPH01282124A JP H01282124 A JPH01282124 A JP H01282124A JP 63111786 A JP63111786 A JP 63111786A JP 11178688 A JP11178688 A JP 11178688A JP H01282124 A JPH01282124 A JP H01282124A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- oxide
- superconducting
- mixture
- powdery
- 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
- 239000000843 powder Substances 0.000 title claims abstract description 70
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 229910002480 Cu-O Inorganic materials 0.000 claims abstract 2
- 239000002994 raw material Substances 0.000 claims description 17
- 239000002131 composite material Substances 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 16
- 229910052799 carbon Inorganic materials 0.000 abstract description 16
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 abstract description 12
- 229910010293 ceramic material Inorganic materials 0.000 abstract description 10
- 239000000203 mixture Substances 0.000 abstract description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract description 4
- 150000001875 compounds Chemical class 0.000 abstract description 4
- 238000001354 calcination Methods 0.000 abstract description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 abstract description 2
- 235000010216 calcium carbonate Nutrition 0.000 abstract description 2
- 229910008649 Tl2O3 Inorganic materials 0.000 abstract 1
- QTQRFJQXXUPYDI-UHFFFAOYSA-N oxo(oxothallanyloxy)thallane Chemical compound O=[Tl]O[Tl]=O QTQRFJQXXUPYDI-UHFFFAOYSA-N 0.000 abstract 1
- 238000010304 firing Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 6
- 238000005245 sintering Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000012733 comparative method Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- Y02E40/64—
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、炭素含有量が著しく低く、シたがって一段
とすぐれた超電導特性を有する超１！導セラミックス材
の表造を可能とするＴｔ−Ｃａ −Ｂａ−Ｃｕ−０系超
電導酸化物粉末の製造法Ｋｌ＆するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention provides super 1! This is a method for producing a Tt-Ca-Ba-Cu-0 based superconducting oxide powder that enables surface formation of conductive ceramic materials.
近年、’ｒｔ−Ｃａ−Ｂａ−Ｃｕ −０系超電導セラミ
ツクス材が提案され、これが、１ず、原料粉末としてＴ
ｔ酸化物（以下Ｔｔ２０．で示す）、Ｃａ炭酸塩（以下
ＣａＣＯ３で示す）、Ｂａ炭酸塩（以下Ｂａ ＣＯ３で
示す〕。In recent years, 'rt-Ca-Ba-Cu-0-based superconducting ceramic materials have been proposed, which are
t oxide (hereinafter referred to as Tt20.), Ca carbonate (hereinafter referred to as CaCO3), and Ba carbonate (hereinafter referred to as BaCO3).
およびＣｕ酸化物（以下ＣｕＯで示す）の粉末を用意し
、これら原料粉末を所定の割合に配合し、混合した後、
この混合粉末に、６００〜７００℃の範囲内の温度に所
定時間保持の焼成処理と粉砕を２〜３回繰り返し施して
Ｔｔ−Ｃａ −Ｂａ −Ｃｕ −Ｑ系超電導酸化物粉末
とし、ついで、この超電辱酸化物粉末を原料粉末として
用いて１通常の条件で圧粉体にブレス成形した後、焼結
することによって製造されることは良く知られるところ
である。After preparing powders of and Cu oxide (hereinafter referred to as CuO) and blending and mixing these raw material powders in a predetermined ratio,
This mixed powder is repeatedly subjected to firing treatment held at a temperature within the range of 600 to 700°C for a predetermined time and pulverization two to three times to obtain a Tt-Ca-Ba-Cu-Q-based superconducting oxide powder. It is well known that it is manufactured by using superelectrode oxide powder as a raw material powder, press-molding it into a green compact under normal conditions, and then sintering it.
しかし、上記の従来法で製造されたＴｌ −Ｃａ −Ｂ
ａ−Ｃｕ−０系超ｔ４酸化物粉末においては、上記のよ
うに焼成を繰シ返し行なっても炭素が残留し。However, Tl-Ca-B produced by the above conventional method
In the a-Cu-0 type super t4 oxide powder, carbon remains even if the firing is repeated as described above.
例えば５回の焼成および粉砕を繰り返し行なっても炭素
含有量を１重−ｍｓ以下に低減することはきわめて困難
であり。このような炭素含有蓋の高いＴｔ−Ｃａ−Ｂａ
−Ｃｕ −０系超電導改化物粉末を原料粉末として用い
て超！導セラミックス材を製造した場合、焼結時に残留
炭素が粒界に析出するようになって十分満足する超１！
尋特性を示さないのが現状でめる。For example, it is extremely difficult to reduce the carbon content to less than 1 weight-ms even if firing and pulverization are repeated five times. High Tt-Ca-Ba of such a carbon-containing lid
-Cu -0 based superconducting modified powder is used as raw material powder to achieve super! When a conductive ceramic material is produced, residual carbon precipitates at the grain boundaries during sintering, which is completely satisfactory!
Currently, it does not exhibit any special characteristics.
そこで１本発明者等は、上述のような観点から。 Therefore, the inventors of the present invention, etc., from the above-mentioned viewpoint.
残留炭素含有蓋の少ないＴｌ−Ｃａ −Ｂａ −Ｃｕ
−０系超蒐導酸化物粉末を装造すべく研究を行なった結
果。Tl-Ca-Ba-Cu with low residual carbon content
-Results of research to prepare 0-based superconducting oxide powder.
まず、原料粉末としてＣａ ＣＯ５初末、 ＢａＣＯ３
粉末。First, as raw material powder, CaCO5 powder, BaCO3
powder.
およびＣｕＯ粉末を用い、これら原料粉末の所定割合の
混合粉末を８５０〜１０５０℃の高温で１次焼成してＣ
ａとＢａとＣｕの複合酸化物（以下Ｃａ−Ｂａ−Ｃｕ７
０系酸化物という）とすると、このＣａ−Ｂａ−Ｃｕ−
０系酸化物は、上記の通り高温焼成処理のために炭酸塩
の分解が完全に起ることから、はとんど炭素を含有せず
、含有してもわずかであり、ついで前記Ｃａ−Ｂａ−Ｃ
ｕ−０系酸化物に所定割合のＴｔ２０３粉末を配合し、
混合した状態で４００〜１２０℃の温度で２次焼成する
と、炭素含有量の著しく低いＴｔ−Ｃａ −Ｂａ −Ｃ
ｕ −０系超電導酸化物粉末が得られるようになシ、こ
れを原料粉末として用いて製造した超１を尋セラミック
ス材は、炭素含有による超電導特性の低下がないので、
−段と高い臨界電流値（Ｊｃ）と臨界温風（ＴＣ） ’
に示すようになるという知見１に得たのである。and CuO powder, a mixed powder of a predetermined ratio of these raw material powders is primarily fired at a high temperature of 850 to 1050°C, and
Composite oxide of a, Ba and Cu (hereinafter referred to as Ca-Ba-Cu7
0 series oxide), this Ca-Ba-Cu-
As mentioned above, carbonate decomposition occurs completely due to the high-temperature calcination treatment, so zero-based oxides almost never contain carbon, and even if they do contain it, it is only a small amount, and then the Ca-Ba -C
A predetermined proportion of Tt203 powder is blended with u-0 type oxide,
When the mixed state is subjected to secondary firing at a temperature of 400 to 120°C, Tt-Ca-Ba-C with extremely low carbon content is produced.
In order to obtain u-0-based superconducting oxide powder, the super-1000 ceramic material produced using this as a raw material powder has no deterioration in superconducting properties due to carbon content.
- Extremely high critical current value (Jc) and critical warm air (TC)'
We obtained the following knowledge as shown in Figure 1.
この発明は、上記知見にもとづいてなされたものであっ
て。This invention was made based on the above findings.
（ａ） 原料粉末として、Ｔｔ２０３粉末、ＣａＣ０
３ｇ末。(a) As raw material powder, Tt203 powder, CaC0
3g end.
ＢａＣＯ３粉末、およびＣｕＯ粉末を用意し。Prepare BaCO3 powder and CuO powder.
（ｂ） まず、これら原料粉末のうちのＣａＣ０Ｂ初
末。(b) First, the starting powder of CaC0B among these raw material powders.
ＢａＣＯ３粉末、およびＣｌｌ０粉末を所定割合に配合
し。BaCO3 powder and Cll0 powder are blended in a predetermined ratio.
混合した後、８５０〜１０５０℃の範囲内の所定温度で
１次焼成して、 Ｃａ−Ｂａ−Ｃｕ −０系酸化物を形
成し。After mixing, primary firing is performed at a predetermined temperature within the range of 850 to 1050°C to form a Ca-Ba-Cu-0 based oxide.
（Ｃ） ツいで、このＣａ−Ｂａ−Ｃｕ −０系酸化
物Ｋ 。(C) This Ca-Ba-Cu-0 based oxide K.
所定割合のＴｔ ２０ 、粉末を配合し、混合した後、
４００〜’７２０℃の範囲内の所定温度で２次焼成する
ことにより炭素含有蓋の著しく低い、含鳴しても超′Ｉ
ＩＬ専特性を損なわないＴｔ−Ｃａ−Ｂａ−Ｃｕ −０
系超電導酸化物粉末を製造する方法に特徴を有するもの
である。After blending and mixing a predetermined ratio of Tt 20 and powder,
By performing secondary firing at a predetermined temperature within the range of 400 to 720 degrees Celsius, the carbon-containing lid has extremely low ringing and ultra-high I.
Tt-Ca-Ba-Cu -0 that does not impair IL-specific characteristics
This method is characterized by a method for producing superconducting oxide powder.
なお、この発明の方法において、１次焼成温度ｆ：８５
０〜１０５０℃と定めたのは、その温度が８５０℃未満
では炭酸塩の分解が不十分で１反応＆相対的に多量の炭
素が残留するのが避けられず、この多量の炭素残留は最
終的に超％専セラミックス材の特性劣化の原因となるも
のであり、一方その温度が１０５０℃を越えるとＣｕＯ
が溶融するようになって均質なＣａ−Ｂａ −Ｃｕ −
０系酸化物の形成が不可能になるという理由によるもの
であシ、また。２次焼成温度を４００〜７２０℃と限定
したのは、その温度が４００℃未満ではＴｔ２ｏ、とＣ
ａ −Ｂａ−Ｃｕ−０系酸化物との反応が不十分で、超
電導酸化物粉末を形成することができず、一方その温度
が７２０℃を越えるとＴｔ ２０ 、が溶融するように
なり１反応が不均一になって超電導酸化物粉末の形成が
できなくなるという理由にもとづくものである。In addition, in the method of this invention, the primary firing temperature f: 85
The reason for setting the temperature range as 0 to 1050°C is that if the temperature is lower than 850°C, carbonate decomposition is insufficient and it is inevitable that one reaction will occur and a relatively large amount of carbon will remain. CuO is the cause of deterioration of the properties of super-ceramic materials, and on the other hand, when the temperature exceeds 1050℃, CuO
melts to form a homogeneous Ca-Ba-Cu-
This is because it becomes impossible to form zero-based oxides. The reason why the secondary firing temperature was limited to 400 to 720°C is that if the temperature is less than 400°C, Tt2o and C
The reaction with a-Ba-Cu-0-based oxide is insufficient and a superconducting oxide powder cannot be formed. On the other hand, when the temperature exceeds 720°C, Tt 20 begins to melt and one reaction occurs. This is based on the reason that the superconducting oxide powder becomes non-uniform and it becomes impossible to form a superconducting oxide powder.
つぎに、この発明の方法を実施例によシ具体的に説明す
る。Next, the method of the present invention will be specifically explained using examples.
原料粉末として、いずれも６μ鼠の平均粒径を有し、か
つ純ｇ：９９．９％のＣａ ＣＯ５粉末、 ＢａＣＯ５
粉末、 ＣｕＯ粉末、およびＴｔ２ｏ、粉末を用意し、
まず、これら原料粉末のうちのＣａ ＣＯ３粉末、 Ｂ
ａＣＯ３粉末、およびＣｕＯ粉末を用い、これら原料粉
末を第１表に示される配合組成に配合し、ボールミルに
て６時間湿式混合し、乾燥した後、アルミナ容器に入れ
。大気中、第１表に示される温度に５時間保持の条件で
１次焼成を行なってＣａ−Ｂａ −Ｃｕ −０系酸化物
を形成し、ついで、このｃａ−Ｂａ−Ｃｕ−０系酸化物
に、同じく第１表に示される割合（全体で１００重量嘩
）の’ｒｚ２ｏ３粉末を配合し、ボールミルにて５時間
湿式混合し、乾燥した後、大気中、第１表に示される温
度に１０時間保持の条件で２次焼結を行なうことによシ
本発明法１〜８および比較法ト４をそれぞれ実施し、同
じく第１表に示される炭素含有量のＴｔ −Ｃａ −Ｂ
ａ−Ｃｕ −０系超電導酸化物粉末（以下超電導酸化物
粉末という）を製造した。As raw material powders, CaCO5 powder and BaCO5 each have an average particle size of 6 μm and have a purity of 99.9%.
Prepare powder, CuO powder, and Tt2o powder,
First, among these raw material powders, Ca CO3 powder, B
Using aCO3 powder and CuO powder, these raw material powders were blended into the composition shown in Table 1, wet mixed in a ball mill for 6 hours, dried, and then placed in an alumina container. Primary calcination is performed in the atmosphere at the temperature shown in Table 1 for 5 hours to form a Ca-Ba-Cu-0 based oxide, and then this ca-Ba-Cu-0 based oxide is was mixed with 'rz2o3 powder in the proportions shown in Table 1 (100% by weight in total), wet-mixed in a ball mill for 5 hours, dried, and then heated in the air at the temperature shown in Table 1 for 10 minutes. Methods 1 to 8 of the present invention and comparative method 4 were carried out by performing secondary sintering under the conditions of time holding, and Tt-Ca-B with the carbon content shown in Table 1 was obtained.
A-Cu-0-based superconducting oxide powder (hereinafter referred to as superconducting oxide powder) was manufactured.
なお、比較法１〜４は、いずれも１次ま九は２次焼成温
度がこの発明の範囲から外れた条件で行なったものであ
る。It should be noted that Comparative Methods 1 to 4 were all conducted under conditions in which the primary and secondary firing temperatures were outside the range of the present invention.
また、比較の目的で、上記の原料粉末を用い。In addition, for the purpose of comparison, the above raw material powder was used.
これら原料粉末を、ム負囁で、ｂ ＣａＣ０，： ｌ
５．５ ％、ＢａＣＯ３： ３０．６ ％、 ＣｕＯ
： ｌ Ｂ−５ｓ、Ｔｔ２ＣＯｓ：３５．４％の割合で
配合し、５時間の混合を行なった後、乾燥し、ついで大
気中、温度：６８０℃に１０時間保持後、粉砕を１サイ
クルとし、これを５サイクル繰り返し行なうことによシ
従来法全実施し、同じく第１表に示される炭素含南童の
起電導酸化物粉末を製造した。These raw material powders are mixed into b CaC0,: l
5.5%, BaCO3: 30.6%, CuO
: l B-5s, Tt2COs: Blended at a ratio of 35.4%, mixed for 5 hours, dried, then held in the air at a temperature of 680°C for 10 hours, and pulverized for one cycle. By repeating this for 5 cycles, all the conventional methods were carried out, and carbon-containing electromotive conductive oxide powders shown in Table 1 were also produced.
ついで、この結果得られた各種の超を導酸化物粉末を原
料粉末として用い、 ２ ｔｏｎ／ｍ２の圧力で圧粉体
にプレス成形し、ついでこの圧粉体を、大気中、温度二
８９０℃に１０時間保持の条件で焼結することによシ断
面：５ｍＸ５ｍ、長さ：ｌＯ鵡の寸法を有する超１！導
セラミックス材を製造した。Next, the various superstructures obtained as a result were press-molded into a compact at a pressure of 2 tons/m2 using conductive oxide powder as a raw material powder, and then the compact was heated at a temperature of 2,890°C in the atmosphere. By sintering under the condition of holding for 10 hours, it is made into a super 1 piece with dimensions: 5m x 5m, length: 100mm. A conductive ceramic material was manufactured.
また、これらの起電導セラミックス材の臨界電流値（Ｊ
ｃ）と臨界温度ｔ−＃Ｊ定した。この測定結果も第１表
に示した。In addition, the critical current value (J
c) and the critical temperature t-#J were determined. The measurement results are also shown in Table 1.
ｉＬ表に示される結果から５本発明法１〜８で製造され
た炭素含有量の低い超電４＃Ｌ化物粉末を用いた場合、
いずれも従来法で製造されたＦＸ素含有魚の尚ｉ超ＩＩ
Ｌ尋酸化物粉末を用いた場合に比して、−段とすぐれた
超電導特性を有する超電導セラミックス材を製造するこ
とができ、一方、比較法１〜４に見られるようＩｃ、１
次または２次焼成温度のいずれでも、この発明の範囲か
ら外れると。From the results shown in the iL table, when using superelectric 4#L compound powder with low carbon content produced by methods 1 to 8 of the present invention,
Both are FX element-containing fish produced using conventional methods.
It is possible to produce a superconducting ceramic material with superior superconducting properties compared to the case of using L oxide powder, and on the other hand, as seen in Comparative Methods 1 to 4, Ic,
Any subsequent or secondary firing temperature is outside the scope of this invention.
超電導酸化物粉末中に相当量の炭素が残留したり。A considerable amount of carbon remains in the superconducting oxide powder.
あるいは原料粉末としてのＣｕＯ粉末やＴｔ２０３粉末
が溶融して均質な超電導酸化物粉末が得られないことか
ら、これより製造される超電導セラミックス材にすぐれ
た超ｔＳ特性を期待することができないことが明らかで
ある。Alternatively, since CuO powder and Tt203 powder as raw material powders are melted and a homogeneous superconducting oxide powder cannot be obtained, it is clear that superior superconducting ceramic materials cannot be expected to have excellent super-tS properties. It is.
上述のように、この発明の方法によれば、炭素含有量の
きわめて低い超電導酸化物粉末を製造することができ、
したがってこれよシ製造された超電導セラミックス材は
すぐれた超電導特性を具備するようになるのである。As described above, according to the method of the present invention, superconducting oxide powder with extremely low carbon content can be produced,
Therefore, the superconducting ceramic material thus produced has excellent superconducting properties.
Claims (1)
炭酸塩、およびＣｕ酸化物の粉末を用意し、まず、これ
ら原料粉末のうちのＣａ炭酸塩、Ｂａ炭酸塩、およびＣ
ｕ酸化物の粉末を所定割合に混合した後、８５０〜１０
５０℃の範囲内の所定温度で１次焼成して、ＣａとＢａ
とＣｕの複合酸化物を形成し、ついで、このＣａとＢａ
とＣｕの複合酸化物に、所定割合いのＴｌ酸化物粉末を
配合し、混合した後、４００〜７２０℃の範囲内の所定
温度で２次焼成して、Ｔｌ−Ｃａ−Ｂａ−Ｃｕ−Ｏ系超
電導酸化物を形成することを特徴とするＴｌ−Ｃａ−Ｂ
ａ−Ｃｕ−Ｏ系超電導酸化物粉末の製造法。(1) Raw material powders include Tl oxide, Ca carbonate, Ba
Carbonate and Cu oxide powders are prepared, and first, Ca carbonate, Ba carbonate, and C of these raw material powders are prepared.
After mixing the U oxide powder in a predetermined ratio, 850 to 10
Ca and Ba are first fired at a predetermined temperature within the range of 50°C.
A composite oxide of Ca and Cu is formed, and then this Ca and Ba
A predetermined proportion of Tl oxide powder is blended into a composite oxide of Tl-Ca-B characterized by forming a superconducting oxide
Method for producing a-Cu-O-based superconducting oxide powder.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63111786A JPH01282124A (en) | 1988-05-09 | 1988-05-09 | Production of powder of tinfinity-ca-ba-cu-o type superconducting oxide |
| KR1019890701968A KR960011344B1 (en) | 1988-02-26 | 1989-02-27 | Process for producing superconducting(bi,ti)-ca(sr,ba)cu-o ceramic |
| US07/445,629 US5236889A (en) | 1988-02-26 | 1989-02-27 | Process for producing bi-ca-sr-cu-o, tl-ca-sr-cu-o and tl-ba-ca-cu-o superconducting ceramics |
| DE68920240T DE68920240T2 (en) | 1988-02-26 | 1989-02-27 | METHOD FOR PRODUCING CERAMIC SUPRALITERS BASED ON Bi-Ca-Sr-Cu-O, Tl-Ca-Sr-Cu-O AND Tl-Ba-Ca-Cu-O. |
| PCT/JP1989/000199 WO1989008077A1 (en) | 1988-02-26 | 1989-02-27 | PROCESS FOR PRODUCING SUPERCONDUCTING (Bi, Tl)-Ca-(Sr, Ba)-Cu-O CERAMIC |
| EP89902822A EP0358777B1 (en) | 1988-02-26 | 1989-02-27 | PROCESS FOR PRODUCING Bi-Ca-Sr-Cu-O, Tl-Ca-Sr-Cu-O AND Tl-Ba-Ca-Cu-O SUPERCONDUCTING CERAMICS |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63111786A JPH01282124A (en) | 1988-05-09 | 1988-05-09 | Production of powder of tinfinity-ca-ba-cu-o type superconducting oxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01282124A true JPH01282124A (en) | 1989-11-14 |
Family
ID=14570124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63111786A Pending JPH01282124A (en) | 1988-02-26 | 1988-05-09 | Production of powder of tinfinity-ca-ba-cu-o type superconducting oxide |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01282124A (en) |
-
1988
- 1988-05-09 JP JP63111786A patent/JPH01282124A/en active Pending
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