JPH03122020A - Oxide superconductor - Google Patents
Oxide superconductorInfo
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- JPH03122020A JPH03122020A JP1257505A JP25750589A JPH03122020A JP H03122020 A JPH03122020 A JP H03122020A JP 1257505 A JP1257505 A JP 1257505A JP 25750589 A JP25750589 A JP 25750589A JP H03122020 A JPH03122020 A JP H03122020A
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- oxide superconductor
- temperature
- superconductor
- present
- transition
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- 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
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- 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】
〔産業上の利用分野〕
本発明は、少なくともＰｂ、Ｓｒ、Ｃａ、Ｙ及びＣｕよ
り成る金属元素と酸素より構成される酸化物超電導体に
関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an oxide superconductor composed of oxygen and a metal element consisting of at least Pb, Sr, Ca, Y, and Cu.
従来、Ｐｂ、Ｓｒ、Ｃａ、Ｙ−Ｃｕ、○より構成される
Ｐｂ系銅酸化物超電導体としては、Ｐ ｂ２Ｓ ｒ。Conventionally, Pb2Sr is used as a Pb-based copper oxide superconductor composed of Pb, Sr, Ca, Y-Cu, and O.
（Ｃａ ＋ Ｙ ） ＣＬｉ２０ ｙ （以降２２１３
相と記述する）が知られている。ここで、ｙは８もしく
は８に近い数である（Ｒ，Ｊ、Ｃａｖａら、ネイチャー
、ｖｏｌ、３６３．ＰＰ２１１〜２１４．１９８８参照
）。(Ca + Y) CLi20 y (hereinafter 2213
(described as phase) is known. Here, y is 8 or a number close to 8 (see R, J. Cava et al., Nature, vol. 363. PP211-214.1988).
また、（Ｐｂａ−ｓ Ｓｒｏ、ｓ） Ｓｒｚ （Ｃａ、
Ｙ ） Ｃｕ。Also, (Pba-s Sro, s) Srz (Ca,
Y) Cu.
０２（以降１２１２相と記述する）。ここで、Ｚは７も
しくは７に近い数を表す（Ｔ、 Ｒｏｕｉｌｌｏｎら、
フィジカＣ１ｖｏ１．１５９．ｐｐ２０１〜２０８．１
９８９参照）が知られている。これらの物質の臨界温度
は約７０〜１００にと言われている。02 (hereinafter referred to as 1212 phase). Here, Z represents 7 or a number close to 7 (T, Rouillon et al.
Physica C1vo1.159. pp201-208.1
989) is known. The critical temperature of these materials is said to be about 70-100°C.
しかしながら、前記従来のＰｂ、Ｓｒ、Ｃａ、Ｙ、Ｃｕ
、○より構成されるＰｂ系銅酸化物超電導体には１次の
ような問題点があった。However, the conventional Pb, Sr, Ca, Y, Cu
, ○, the Pb-based copper oxide superconductor has the following first-order problems.
超電導材料を各種センサーやデバイスに応用する場合に
は、それぞれの用途に応じて適当な臨界温度を有すると
共に転移復が小さく鋭い超電導転移を示す材料が要求さ
れる。前述のように従来のＰｂ、Ｓｒ、Ｃａ、Ｙ、Ｃｕ
、Ｏより構成されるＰｂ系銅酸化物超電導体は、約７０
〜１００Ｋの臨界温度を有するが、この場合の臨界温度
とは試料の電気抵抗が超電導現象により減少し始める温
度を表している。このような温度を一般にオンセント温
度と称している。これに対して実際に試料の電気抵抗が
ゼロになる温度は、一般にオンセット温度より低温であ
る。このような温度を一般にゼロ抵抗温度と称する。When superconducting materials are applied to various sensors and devices, materials are required that have an appropriate critical temperature depending on the application, and exhibit a sharp superconducting transition with a small reversal. As mentioned above, conventional Pb, Sr, Ca, Y, Cu
, O, the Pb-based copper oxide superconductor is about 70
It has a critical temperature of ~100K, and the critical temperature in this case represents the temperature at which the electrical resistance of the sample begins to decrease due to superconducting phenomena. Such a temperature is generally called an on-cent temperature. On the other hand, the temperature at which the electrical resistance of the sample actually becomes zero is generally lower than the onset temperature. Such a temperature is generally referred to as zero resistance temperature.
従来のＰｂ、Ｓｒ、Ｃａ、Ｙ、Ｃｕ、○より構成される
Ｐｂｂ銅酸化物超電導材料は、第２図（Ｍ、Ａ、Ｓｕｂ
ｒａｍａｎｉａｎ ｅｔａｌ、Ｐｈｙｓｉｃａ、Ｃ１５
７，ｐｐ１２４〜１３０参照）及び第３図（Ｔ、Ｒｏｕ
ｉｌｌｏｎ ｅｔａｌ、Ｐｈｙｓｉｃａ、Ｃ１５９，ｐ
ｐ２０１〜２０８参照）に示すように、このオンセット
温度とゼロ抵抗温度との差（転移幅）が大きく超電導転
移がブロードであった。即ち、前記の文献によれば、２
２１３相の転移幅は１５に以上、１２１２相の転移幅は
４７以上であり、このような転移幅の広さは、高精度の
センサーやデバイスへの応用にとって障害となるもので
あった。The conventional Pbb copper oxide superconducting material composed of Pb, Sr, Ca, Y, Cu, and ○ is shown in Fig. 2 (M, A, Sub
ramanian etal, Physica, C15
7, pp. 124-130) and Figure 3 (T, Rou
illon etal, Physica, C159, p
As shown in pages 201 to 208), the difference (transition width) between the onset temperature and the zero resistance temperature was large, and the superconducting transition was broad. That is, according to the above-mentioned document, 2
The transition width of the 213 phase is 15 or more, and the transition width of the 1212 phase is 47 or more, and such wide transition widths have been an obstacle to application to high-precision sensors and devices.
本発明は、このような従来の問題点を解決するためにな
されたもので、転移幅が小さく、鋭い超電導転移を示す
新規なＰｂｂ銅酸化物超電導材料を提供することを目的
とする。The present invention was made to solve these conventional problems, and an object of the present invention is to provide a novel Pbb copper oxide superconducting material that has a narrow transition width and exhibits a sharp superconducting transition.
本発明の前記ならびにその他の目的と新規な特徴は、本
明細書の記述及び添付図面によって明らかになるであろ
う。The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.
前記目的を達成するために、本発明のＰｂ系系層酸化物
超電導体、Ｐｂ、Ｓｒ、Ｃａ、Ｙ及びＣｕより成る金属
元素と酸素より構成される酸化物超電導体であって、前
記金属元素の組成が次の化学組成式で表されることを特
徴とする。In order to achieve the above object, the present invention provides a Pb-based layered oxide superconductor, an oxide superconductor composed of a metal element consisting of Pb, Sr, Ca, Y, and Cu, and oxygen, wherein the metal element The composition is represented by the following chemical composition formula.
Ａ ａ （Ｓｒ、 Ｂ、、 ） ｂ
但し、ＡはＰｂとＣｕとの組合せ、ＢはＣａとＹとの組
合せであり、ａ、ｂ、ｘは全てＯと１との間の数で、そ
れぞれ、ａ＋ｂ＝１、ｂ≧０．４、Ｘ≦０．７を満足す
る範囲の数である。A a (Sr, B,, ) b However, A is a combination of Pb and Cu, B is a combination of Ca and Y, and a, b, and x are all numbers between O and 1, and each , a+b=1, b≧0.4, and X≦0.7.
なお１本明細書においては、本発明のＰｂ系系層酸化物
超電導体化学組成式を、前記Ａａ、（Ｓｒ。In this specification, the chemical composition formula of the Pb-based layered oxide superconductor of the present invention is expressed as Aa, (Sr.
Ｂ□−Ｘ）ｂのように記述する。前記ＰｂとＣｕ及びＣ
ａとＹとは結晶構造中で互いに位置を交換しあうことが
可能であると考えられるために、従来のような１２１２
相や２２１３相といった表式を用いずに前記のような表
式を用いるものである。B□-X) Describe it as b. The Pb, Cu and C
Since a and Y are thought to be able to exchange positions with each other in the crystal structure, the conventional 1212
The above expression is used instead of expressions such as phase and 2213 phase.
つまり、本発明のＰｂ系系層酸化物超電導体、各構成金
属元素の組成が、前記の化学組成式Ａａ（ＳｒつＢ□−
ｘ）ｂとなるように、原料試薬を混合したものを成形し
て、酸化性雰囲気下で焼結した酸化物超電導体である。That is, the composition of each constituent metal element in the Pb-based layered oxide superconductor of the present invention is based on the chemical composition formula Aa (Sr B□-
x) This is an oxide superconductor obtained by molding a mixture of raw material reagents and sintering it in an oxidizing atmosphere so as to obtain b.
本発明のＰｂ系系層酸化物超電導体、従来のＰｂ、 Ｓ
ｒ、 Ｃａ、 Ｙ、 Ｃｕ、○より構成されるＰｂ系系
層酸化物超電導体比較した場合、その構成元素の比率が
全く異なっている。構成元素の比率の違いは、得られる
超電導体の超電導特性に大きな影響を及ぼす。Pb-based layered oxide superconductor of the present invention, conventional Pb, S
When comparing Pb-based layered oxide superconductors composed of r, Ca, Y, Cu, and O, the ratios of their constituent elements are completely different. Differences in the ratios of constituent elements have a large effect on the superconducting properties of the resulting superconductor.
本発明のＰｂ系系層酸化物超電導体、従来知られている
１２１２相と比べて、構成元素の比率において、相対的
にＣａやＹよりもイオン半径の大きいＳｒの比率が少な
い。このことがＰｂ系系層酸化物超電導体結晶を構成す
る際に影響を与えるため、転移幅が小さく鋭い超電導転
移を示す良質のＰｂ系系層酸化物超電導体得る上でＳｒ
の量が少ないことが必須となるものと考える。In the Pb-based layered oxide superconductor of the present invention, compared to the conventionally known 1212 phase, the ratio of Sr, which has a relatively larger ionic radius than Ca and Y, is smaller in the ratio of constituent elements. This affects the formation of Pb-based layered oxide superconductor crystals, so Sr
We believe that it is essential that the amount of
以下、本発明を実施例に基いて具体的に説明する。Hereinafter, the present invention will be specifically explained based on Examples.
〔実施例１〕
原料として、Ｐｂ０，５ｒ２Ｃｕｂａ、ＣａＯ，Ｙ２Ｏ
、及びＣｕＯを用い、Ｐｂ、Ｓｎ、Ｃａ、Ｙ、Ｃｕの比
率がＰ ｂ （Ｓ ｒ２ｉｉ Ｃａｘｙｂ Ｙ １／ｓ
） ｙ ＣＬＩ２の組成となるように混合した。５ｒ
２Ｃｕ○３は市販の５ｒＣＯ１とＣｕＯを混合して空気
中で１０００℃で焼成して合成したものを用いた。この
得られた混合粉末をプレス成形した後、１気圧の酸素気
流中で１０００℃、１０時間焼結させて酸化物超電導体
とした。[Example 1] As raw materials, Pb0,5r2Cuba, CaO, Y2O
, and CuO, and the ratio of Pb, Sn, Ca, Y, and Cu is P b (S r2ii Caxyb Y 1/s
) y were mixed to have the composition of CLI2. 5r
2Cu○3 was synthesized by mixing commercially available 5rCO1 and CuO and baking the mixture in air at 1000°C. The obtained mixed powder was press-molded and then sintered at 1000° C. for 10 hours in an oxygen stream of 1 atm to obtain an oxide superconductor.
本実施例１は、前記の化学組成式Ａａ（Ｓｒ、Ｂ、−、
）ｂにおいて、ａ ＝ １ ／ ２、ｂ＝１／２、Ｘ＝
２７３の場合に相当する。このようにして得られた酸化
物超電導体の、液体ヘリウム温度と室温との間の電気抵
抗率の温度依存性を、通常の４端子法で測定した。その
結果を第１図に示す。The present Example 1 has the chemical composition formula Aa (Sr, B, -,
) in b, a = 1/2, b = 1/2, X =
This corresponds to the case of 273. The temperature dependence of the electrical resistivity of the oxide superconductor thus obtained between the liquid helium temperature and room temperature was measured using a conventional four-terminal method. The results are shown in FIG.
この実施例１の酸化物超電導体は、第１図かられかるよ
うに、オンセント温度が２８Ｋ、ゼロ抵抗温度が１７に
であり、転移幅は９にであった。As can be seen from FIG. 1, the oxide superconductor of Example 1 had an on-cent temperature of 28K, a zero resistance temperature of 17K, and a transition width of 9K.
また、この実施例１の酸化物超電導体の交流帯磁率を測
定したところ、２８に以下でマイスナー効果のために測
定値は、負の値になった。Further, when the AC magnetic susceptibility of the oxide superconductor of Example 1 was measured, the measured value became a negative value at 28 or below due to the Meissner effect.
また、この本実施例１の酸化物超電導体のＸ線回折を行
ったところ超電導体の結晶構成は１２１２相と同じであ
ることがわかった。Furthermore, when the oxide superconductor of Example 1 was subjected to X-ray diffraction, it was found that the crystal structure of the superconductor was the same as the 1212 phase.
また、この実施例１の酸化物超電導体の酸素量は、酸素
分析の結果、化学組成式Ｐｂ （Ｓｒ２７．Ｃａ、７．
、Ｙ、７．、） ３Ｃｕ２０．において、２の値として
約７であることがわかった。Further, the oxygen content of the oxide superconductor of Example 1 was determined by the chemical composition formula Pb (Sr27.Ca, 7.
,Y,7. ) 3Cu20. It was found that the value of 2 is approximately 7.
〔実施例２〕
本実施例２の酸化物超電導体は、前記実施例１と同じ原
料を用いてＰｂ、Ｓｒ、Ｃａ、Ｙ、Ｃｕの比率がｐ ｌ
）（、，５（Ｓ ｒｌ ／２ Ｃａ、 ／３ ＹｚｚＪ
ｉ ＋５ Ｃｕ２となるように合成した。この得られた
混合粉末をプレス成形した後、１気圧の酸素気流中で９
２０°Ｃ１１００時間焼結させて酸化物超電導体とした
。この実施例２の酸化物超電導体は、前記の化学組成式
Ａａ（ＳｒｘＢｌ−、、）ｂにおいて、ａ ＝ ５ ／
１２、ｂ＝７／１２、ｘ ＝ １ ／ ２の場合に相
当する。[Example 2] The oxide superconductor of Example 2 uses the same raw materials as in Example 1 and has a ratio of Pb, Sr, Ca, Y, and Cu of p l
)(,,5(S rl /2 Ca, /3 YzzJ
It was synthesized to become i +5 Cu2. After press-molding the obtained mixed powder, it was
It was sintered at 20°C for 1100 hours to obtain an oxide superconductor. The oxide superconductor of Example 2 has the chemical composition formula Aa(SrxBl-,,)b in which a = 5/
12, b=7/12, and x=1/2.
この実施例２の酸化物超電導体も、４端子法による電気
抵抗率の測定において、オンセット温度２４Ｋ、ゼロ抵
抗温度１４Ｋを示し、転移幅は１０にであった。The oxide superconductor of Example 2 also exhibited an onset temperature of 24 K, a zero resistance temperature of 14 K, and a transition width of 10 when measuring electrical resistivity using the four-probe method.
また、この実施例２の酸化物超電導体のＶ素地は、酸素
分析の結果、化学組成式Ｐｂｏ、、（Ｓｒ０．□Ｃａｉ
／３Ｙ２／６）３．５Ｃｕ２０２において、Ｚの値とし
て約６．９であることがわかった。Further, as a result of oxygen analysis, the chemical composition formula of the V substrate of the oxide superconductor of Example 2 is Pbo, (Sr0.□Cai
/3Y2/6) 3.5Cu202, the value of Z was found to be approximately 6.9.
〔実施例３〕
本実施例３の酸化物超電導体は、前記実施例２と同様な
方法で、前記の化学組成式Ａａ（ＳｒつＢ１−、）ｂに
おいて、ａ＝０．４、ｂ＝０．６、χ０．４２の試料を
合成して酸化物超電導体を得た。[Example 3] The oxide superconductor of Example 3 was prepared using the same method as in Example 2, and in the chemical composition formula Aa(Sr×B1-,)b, a=0.4, b= 0.6 and χ0.42 samples were synthesized to obtain an oxide superconductor.
この実施例３の酸化物超電導体は、オンセント温度２４
Ｋ、ゼロ抵抗温度１４Ｋを示し、転移幅はＩＯＫであっ
た。The oxide superconductor of Example 3 has an on-cent temperature of 24
K, the zero resistance temperature was 14 K, and the transition width was IOK.
なお、前記の化学組成式Ａａ（Ｓｒ、Ｂ、、）ｂにおい
て、ｂの値が０．４より小さい場合は１２１２相型の結
晶構造が得られにくいため、ｂの値としては０．４以上
であることが必要である。In addition, in the above chemical composition formula Aa (Sr, B, , ) b, if the value of b is smaller than 0.4, it is difficult to obtain a 1212 phase type crystal structure, so the value of b should be 0.4 or more. It is necessary that
また、Ｘの値が０．７より大きくなる場合は、超電導性
を示すもののＳｒの量が多いために転移幅が広くなるた
め、Ｘの値としては０．７以下であることが必要である
。。Furthermore, if the value of X is greater than 0.7, the dislocation width becomes wider due to the large amount of Sr although it exhibits superconductivity, so the value of X needs to be 0.7 or less. . .
以上の説明かられかるように、前記実施例１〜３の酸化
物超電導体によれば、転移幅が小さく、鋭い超電導転移
を示すので、今後新しいセンサーやデバイス等に応用す
ることができる。As can be seen from the above description, the oxide superconductors of Examples 1 to 3 have small transition widths and exhibit sharp superconducting transitions, so they can be applied to new sensors, devices, etc. in the future.
また、さらに、ｙＫ材料の合成条件を詳細に検討するこ
とにより、さらに高い転移温度を示す可能性をも秘めた
超電導材料である。Furthermore, by studying the synthesis conditions of yK material in detail, it is a superconducting material that has the potential to exhibit an even higher transition temperature.
また、本発明のＰｂ系銅酸化物超電導体は、Ｐｂを含む
ために、他の酸化物超電導体に比べて加工性が良いこと
が予測される。Further, since the Pb-based copper oxide superconductor of the present invention contains Pb, it is expected that it has better workability than other oxide superconductors.
また、本発明のＰｂ系銅酸化物超電導体は、Ｐｂ系であ
るので、製造が容易であり、製造コストも安価となるこ
とが予測できる。In addition, since the Pb-based copper oxide superconductor of the present invention is Pb-based, it is easy to manufacture and can be expected to have low manufacturing cost.
また、本発明のＰｂ系銅酸化物超電導体は、酸素量の厳
密な制御、銅−酸素面数の増加等により、さらに高い転
移温度（臨界温度）を示すことが予測できる。Further, it is predicted that the Pb-based copper oxide superconductor of the present invention exhibits an even higher transition temperature (critical temperature) due to strict control of the amount of oxygen, increase in the number of copper-oxygen planes, and the like.
以上、本発明を実施例に基き具体的に説明したが、本発
明は、前記実施例に限定されるものではなく、その要旨
を逸脱しない範囲において種々変更可能であることは言
うまでもない。Although the present invention has been specifically explained above based on Examples, it goes without saying that the present invention is not limited to the above-mentioned Examples and can be modified in various ways without departing from the gist thereof.
本発明の新規な酸化物超電導体は、前記説明では、鋭い
超電導転移に注目して説明したが、それ以外の特性も種
々の分野で応用できることは勿論である。Although the novel oxide superconductor of the present invention has been described above with a focus on its sharp superconducting transition, it goes without saying that other characteristics can also be applied in various fields.
以上、説明したように、本発明の新規な酸化物超電導体
によれば、転移幅が小さく、鋭い超電２厚転移を示すの
で、今後新しいセンサーやデバイス等に応用することが
できる。As described above, the novel oxide superconductor of the present invention has a small transition width and exhibits a sharp superelectric two-thickness transition, so it can be applied to new sensors, devices, etc. in the future.
第１図は、本発明の実施例１の酸化物超電導体の電気抵
抗率−温度特性を示す図、
第２図及び第３図は、従来の酸化物超電導体の電気抵抗
−温度特性を示す図である。FIG. 1 is a diagram showing the electrical resistivity-temperature characteristics of the oxide superconductor of Example 1 of the present invention. FIGS. 2 and 3 are diagrams showing the electrical resistance-temperature characteristics of the conventional oxide superconductor. It is a diagram.
Claims (1)
と酸素より構成される酸化物超電導体であって、前記金
属元素の組成が次の化学組成式で表されることを特徴と
する酸化物超電体。 Ａａ（Ｓｒ＿ｘＢ＿１＿−＿ｘ）ｂ 但し、ＡはＰｂとＣｕとの組合せ、ＢはＣａとＹとの組
合せであり、ａ，ｂ，ｘは全て０と１との間の数で、そ
れぞれ、ａ＋ｂ＝１、ｂ≧０．４、ｘ≦０．７を満足す
る範囲の数である。(1) An oxide superconductor composed of metal elements consisting of Pb, Sr, Ca, Y, and Cu and oxygen, characterized in that the composition of the metal elements is represented by the following chemical composition formula: Oxide superelectric. Aa(Sr_xB_1_-_x)b However, A is a combination of Pb and Cu, B is a combination of Ca and Y, a, b, and x are all numbers between 0 and 1, and a+b= 1, b≧0.4, and x≦0.7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1257505A JPH03122020A (en) | 1989-10-02 | 1989-10-02 | Oxide superconductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1257505A JPH03122020A (en) | 1989-10-02 | 1989-10-02 | Oxide superconductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03122020A true JPH03122020A (en) | 1991-05-24 |
Family
ID=17307231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1257505A Pending JPH03122020A (en) | 1989-10-02 | 1989-10-02 | Oxide superconductor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03122020A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002529688A (en) * | 1998-10-30 | 2002-09-10 | ハイ−スピード チェックウェイヤー コー インク | Pneumatic high-speed weighing device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03505571A (en) * | 1989-04-11 | 1991-12-05 | トムソン―セーエスエフ | (ACuO3-X)2(A'O) Mixed valent copper oxide derived from 2 type perovskite structure |
| JPH04501407A (en) * | 1988-10-26 | 1992-03-12 | イー・アイ・デユポン・ドウ・ヌムール・アンド・カンパニー | Superconducting metal oxide composition and method for producing and using the same |
-
1989
- 1989-10-02 JP JP1257505A patent/JPH03122020A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04501407A (en) * | 1988-10-26 | 1992-03-12 | イー・アイ・デユポン・ドウ・ヌムール・アンド・カンパニー | Superconducting metal oxide composition and method for producing and using the same |
| JPH03505571A (en) * | 1989-04-11 | 1991-12-05 | トムソン―セーエスエフ | (ACuO3-X)2(A'O) Mixed valent copper oxide derived from 2 type perovskite structure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002529688A (en) * | 1998-10-30 | 2002-09-10 | ハイ−スピード チェックウェイヤー コー インク | Pneumatic high-speed weighing device |
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