JPH02129029A - Oxide superconductor composition and production thereof - Google Patents
Oxide superconductor composition and production thereofInfo
- Publication number
- JPH02129029A JPH02129029A JP63281913A JP28191388A JPH02129029A JP H02129029 A JPH02129029 A JP H02129029A JP 63281913 A JP63281913 A JP 63281913A JP 28191388 A JP28191388 A JP 28191388A JP H02129029 A JPH02129029 A JP H02129029A
- Authority
- JP
- Japan
- Prior art keywords
- composition
- superconducting
- temperature
- oxide superconductor
- followed
- 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.)
- Granted
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 19
- 239000002887 superconductor Substances 0.000 title claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims abstract 3
- 238000000465 moulding Methods 0.000 claims 1
- 230000007704 transition Effects 0.000 abstract description 14
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 abstract description 5
- 238000005245 sintering Methods 0.000 abstract description 5
- 229910008649 Tl2O3 Inorganic materials 0.000 abstract 2
- 238000010438 heat treatment Methods 0.000 abstract 2
- QTQRFJQXXUPYDI-UHFFFAOYSA-N oxo(oxothallanyloxy)thallane Chemical compound O=[Tl]O[Tl]=O QTQRFJQXXUPYDI-UHFFFAOYSA-N 0.000 abstract 2
- 239000011369 resultant mixture Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 10
- 230000007423 decrease Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 2
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- 238000005404 magnetometry Methods 0.000 description 2
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229960004643 cupric oxide Drugs 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- WKMKTIVRRLOHAJ-UHFFFAOYSA-N oxygen(2-);thallium(1+) Chemical compound [O-2].[Tl+].[Tl+] WKMKTIVRRLOHAJ-UHFFFAOYSA-N 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910003438 thallium oxide Inorganic materials 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
- 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）
本発明は、各種の超伝導応用装置や超伝導素子に使用さ
れる酸化物超伝導材料に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to oxide superconducting materials used in various superconducting application devices and superconducting elements.
（従来の技術）
超伝導材料として現在実用化されているものとして、金
属・合金系超伝導材料、化合物超伝導材料などがある。(Prior Art) Superconducting materials currently in practical use include metal/alloy superconducting materials and compound superconducting materials.
超伝導材料はジョセフソン素子などのエレクトロニクス
デバイスや超伝導磁石用のコイルなどを作るのに用いら
れ、特にジョセフソン接合の高感度性、高精度性、低雑
音性を利用した５ＱＵＩＤや精密計測への応用の他、ジ
ョセフソン接合の高速応答性と低消費電力性に着目した
電子計算機への応用が期待されている。Superconducting materials are used to make electronic devices such as Josephson elements and coils for superconducting magnets, and are particularly useful for 5QUID and precision measurement that utilize the high sensitivity, high precision, and low noise properties of Josephson junctions. In addition to applications in electronic computers, Josephson junctions are expected to have applications that focus on their high-speed response and low power consumption.
超伝導材料の超伝導転移温度Ｔｃは、できるだけ高いこ
とが望まれるカミ３０にのＴｃを持つＬａ−Ｂａ−Ｃｕ
−０系酸化物超伝導体の発見以来、９０に級のＢａ−Ｙ
−Ｃｕ−０系、１１０に級のＢ１−３ｒ−Ｃａ−Ｃｕ−
○系、１２０に級のＴｌ−Ｂａ−Ｃａ−Ｃｕ−○系など
が相次いで発見されてきた。液体窒素温度をはるかに越
えたＴｃをもつ材料の発見は、実用材料としての期待を
ますます高めている。The superconducting transition temperature Tc of the superconducting material is desired to be as high as possible.
Since the discovery of -0-based oxide superconductors, Ba-Y
-Cu-0 series, 110 grade B1-3r-Ca-Cu-
○ series, 120 grade Tl-Ba-Ca-Cu-○ series, etc. have been discovered one after another. The discovery of a material with a Tc that far exceeds the temperature of liquid nitrogen has raised expectations for its use as a practical material.
（発明が解決しようとする問題点）
超伝導転移温度Ｔｃは物質に固有のものであり、磁場を
かけない場合には常にほぼ一定の値である。構成元素の
組成比を変化させると見かけ上超伝導転移温度が下がる
がこれは、超伝導に転移する体積分率が減少し、転移が
鈍化するためである。任意の温度で、全体積がシャープ
に超伝導転移する物質を得ることができれば、温度セン
サーをはじめとする多くの応用が開けてくる。(Problems to be Solved by the Invention) The superconducting transition temperature Tc is unique to a substance, and is always a substantially constant value when no magnetic field is applied. Changing the composition ratio of the constituent elements apparently lowers the superconducting transition temperature, but this is because the volume fraction that transitions to superconductivity decreases and the transition slows down. If we can obtain a material whose total volume undergoes a sharp superconducting transition at a given temperature, it will open up many applications, including temperature sensors.
そこで本発明の目的は、１１６に以下の任意の温度で、
鋭い超伝導転移を示す酸化物超伝導体組成物及びその作
製方法を提供することにある。Therefore, the object of the present invention is to: 116 at any temperature below.
An object of the present invention is to provide an oxide superconductor composition exhibiting a sharp superconducting transition and a method for producing the same.
（問題点を解決するための手段）
本発明は、ＴｌＢａ２（Ｃａ１− ｘＹｘ）２Ｃｕ３０
ｙなる組成式で０．１≦ｘ≦０．８なる組成を８７０℃
〜９１０℃で焼結すればＴｃを連続的に変えることがで
きること、及び焼結の際にプレス成形体を金箔で包むこ
とにより上記組成物の特性がさらに向上することを見い
だしたものである。(Means for solving the problems) The present invention provides TlBa2(Ca1-xYx)2Cu30
The composition of 0.1≦x≦0.8 with the composition formula y is 870℃
It was discovered that Tc can be changed continuously by sintering at ~910°C, and that the properties of the composition can be further improved by wrapping the press-formed body with gold foil during sintering.
（作用）
例えば、ＴｌＢａ２（ＣａＯ１７Ｙｏ、３）２Ｃｕ３０
．なる組成物は９０にで、ＴｌＢａ２（ＣａＯ１４ＹＯ
，６）２Ｃｕ３０．なる組成物は４０にでそれぞれシャ
ープな超伝導転移を示し、転移後は全体積の８０％以上
が超伝導状態になっていることが確認された。(Action) For example, TlBa2(CaO17Yo, 3)2Cu30
．． The composition is 90% TlBa2(CaO14YO
,6)2Cu30. It was confirmed that each of the compositions exhibited a sharp superconducting transition at 40°C, and that more than 80% of the total volume was in a superconducting state after the transition.
（実施例）
以下実施例により、本発明を具体的に説明する。出発原
料として純度９９．９％以上の酸化タリウム（Ｔ１２０
３）、酸化バリウム（Ｂａｄ）、酸化カルシウム（Ｃａ
Ｏ）、酸化イツトリウム（Ｙ２Ｏ２）、酸化第２銅（Ｃ
ｕｂ）を使用し第１表に示す配合比になるように各々秤
量した。次に秤量した各材料を乳鉢でよく混合した後、
プレスして５ｍｍＸ１０ｍｍＸ１ｍｍのプレス体を作成
した。このプレス体を金箔で包み、酸素雰囲気中で８７
０℃〜９１０℃で１〜１０時間焼結した。(Example) The present invention will be specifically described below with reference to Examples. Thallium oxide (T120) with a purity of 99.9% or more is used as a starting material.
3), barium oxide (Bad), calcium oxide (Ca
O), yttrium oxide (Y2O2), cupric oxide (C
ub), and each was weighed so as to have the blending ratio shown in Table 1. Next, after mixing the weighed ingredients thoroughly in a mortar,
A pressed body of 5 mm x 10 mm x 1 mm was created by pressing. This pressed body was wrapped in gold foil and placed in an oxygen atmosphere for 87 days.
Sintering was performed at 0°C to 910°C for 1 to 10 hours.
第１表の範囲の焼結体について抵抗率、超伝導体積分率
の測定を行い超伝導特性を評価した。The resistivity and superconducting volume fraction of the sintered bodies in the range shown in Table 1 were measured to evaluate the superconducting properties.
抵抗率測定は直流４端子法によって行った。電極は金を
スパッタリング法にて取り付はリードとして錫メツキ銅
線を用いた。Resistivity measurement was performed by a DC 4-terminal method. The electrodes were sputtered with gold, and the leads were attached using tin-plated copper wire.
超伝導体積分率は交流帯磁率測定より求めた。The superconducting volume fraction was determined by AC magnetic susceptibility measurement.
交流帯磁率はコイルの中にサンプルをいれコイルのＬの
変化を測定することによって行った。体積分率は、同体
積、同じ形状の鉛の４．２ＫにおけるΔＬを１００とし
て算出した。抵抗測定は室温から抵抗が０になる温度ま
で、帯磁率測定は室温から４．２Ｋまで行った。AC magnetic susceptibility was measured by placing a sample in a coil and measuring the change in L of the coil. The volume fraction was calculated by setting ΔL at 4.2K of lead having the same volume and shape as 100. Resistance measurements were carried out from room temperature to the temperature at which resistance becomes 0, and magnetic susceptibility measurements were carried out from room temperature to 4.2K.
第１表に配合比と抵抗が０になる臨界温度４．２にでの
超伝導相の割合を示す。プレス成形体を金箔で包まずに
焼成した場合は焼成中にＴ１が消失するため、組成ずれ
が生じ、体積分率がやや低下する。Ｘの範囲については
、Ｘが０．１未満では、超伝導特性はほとんど変化しな
いため本発明の目的には不適当である。またＸが０．８
を越えると室温から４．２Ｋまで超伝導を示さなくなる
ため実用的でない。焼結温度については８７０℃未満で
は、本組成物よりも結晶周期の短いＴｌＢａ２（Ｃａｌ
−ｘＹｘ）Ｃｕ２０．との混合物ができるため１００に
以上のＴｃを示す体積分率が低くなる。また９１０℃を
越えると分解が起こるため体積分率が低下する。Table 1 shows the blending ratio and the proportion of the superconducting phase at the critical temperature of 4.2 at which the resistance becomes zero. If the press-formed body is fired without being wrapped in gold foil, T1 disappears during firing, resulting in a compositional deviation and a slight decrease in volume fraction. Regarding the range of X, if X is less than 0.1, the superconducting properties hardly change, and this is inappropriate for the purpose of the present invention. Also, X is 0.8
If the temperature exceeds this temperature, superconductivity will not be exhibited from room temperature to 4.2K, which is not practical. Regarding the sintering temperature, when the temperature is lower than 870°C, TlBa2 (Cal
-xYx)Cu20. Since a mixture with Tc is formed, the volume fraction exhibiting Tc of 100 or more becomes low. Moreover, when the temperature exceeds 910° C., decomposition occurs and the volume fraction decreases.
第１表
（発明の効果）
本発明の組成物はＸの値により連続的にＴｃを制御でき
、しかも鋭い超伝導転移を示すため、超伝導材料として
非常に実用性の高いものである。Table 1 (Effects of the Invention) The composition of the present invention allows Tc to be continuously controlled by the value of X and exhibits a sharp superconducting transition, so it is highly practical as a superconducting material.
Claims (2)
Ｃｕ＿３Ｏ＿ｙと表した酸化物超伝導体組成物において
０．１≦ｘ≦０．８なる範囲にあることを特徴とする酸
化物超伝導体組成物。1. Tl_1Ba_2(Ca_1_-_xY_x)_2
An oxide superconductor composition expressed as Cu_3O_y, characterized in that the oxide superconductor composition is in the range of 0.1≦x≦0.8.
ＣｕＯ粉末を特許請求の範囲第１項記載の組成となるよ
う混合し、プレス成形した後、８７０℃から９１０℃の
温度範囲で熱処理することを特徴とする酸化物超伝導体
組成物の製造方法。2. Tl_2O_3, BaO, CaO, Y_2O_3,
A method for producing an oxide superconductor composition, which comprises mixing CuO powder to have the composition set forth in claim 1, press-molding, and then heat-treating at a temperature range of 870°C to 910°C. .
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63281913A JPH02129029A (en) | 1988-11-07 | 1988-11-07 | Oxide superconductor composition and production thereof |
| EP89120517A EP0368210B1 (en) | 1988-11-07 | 1989-11-06 | An oxide superconductor composition and a process for the production thereof |
| DE68921144T DE68921144T2 (en) | 1988-11-07 | 1989-11-06 | Oxide superconductor composition and process for its manufacture. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63281913A JPH02129029A (en) | 1988-11-07 | 1988-11-07 | Oxide superconductor composition and production thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02129029A true JPH02129029A (en) | 1990-05-17 |
| JPH0521851B2 JPH0521851B2 (en) | 1993-03-25 |
Family
ID=17645700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63281913A Granted JPH02129029A (en) | 1988-11-07 | 1988-11-07 | Oxide superconductor composition and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02129029A (en) |
-
1988
- 1988-11-07 JP JP63281913A patent/JPH02129029A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0521851B2 (en) | 1993-03-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |