JPH02129028A - Oxide superconductor composition and production thereof - Google Patents
Oxide superconductor composition and production thereofInfo
- Publication number
- JPH02129028A JPH02129028A JP63281912A JP28191288A JPH02129028A JP H02129028 A JPH02129028 A JP H02129028A JP 63281912 A JP63281912 A JP 63281912A JP 28191288 A JP28191288 A JP 28191288A JP H02129028 A JPH02129028 A JP H02129028A
- Authority
- JP
- Japan
- Prior art keywords
- composition
- superconducting
- temperature
- superconductivity transition
- oxide superconductor
- 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
- 239000000203 mixture Substances 0.000 title claims abstract description 16
- 239000002887 superconductor Substances 0.000 title claims description 6
- 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 4
- 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
- 239000011575 calcium Substances 0.000 description 2
- 230000000694 effects 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
- 229910014454 Ca-Cu Inorganic materials 0.000 description 1
- 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
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229960004643 cupric oxide Drugs 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000007788 liquid 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
- 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
- KFAIYPBIFILLEZ-UHFFFAOYSA-N thallium(i) oxide Chemical compound [Tl]O[Tl] KFAIYPBIFILLEZ-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
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８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-8 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
とが望まれるが、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、１１０ＫＲのＢ１−８ｒ−Ｃａ−Ｃｕ
−０系、１２０に級のＴｌ−Ｂａ−Ｃａ−Ｃｕ−０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。It is desired that the superconducting transition temperature Tc of the superconducting material is as high as possible, but La-Ba-Cu with a Tc of 30
Since the discovery of -0 series oxide superconductors, the Ba-
Y-Cu-0 series, 110KR B1-8r-Ca-Cu
-0 series, 120 grade Tl-Ba-Ca-Cu-0 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ン
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。(Problem to be solved by the invention) The superconducting transition temperature Tc is unique to a substance and is always a nearly constant value when no magnetic field is applied. The superconducting transition temperature decreases 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, This opens up many applications, including temperature sensors.
そこで本発明の目的は、１００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: At any temperature below 100,
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（Ｃａｌ−ｘＹｘ）Ｃｕ２０．な
る組成式で０．１≦ｘ≦０．７５なる組成を８５０’Ｃ
〜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(Cal-xYx)Cu20. At 850'C, the composition is 0.1≦x≦0.75.
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（Ｃａ□、７Ｙｏ、３）Ｃｕ２０ｙな
る組成物は９０にで、ＴｌＢａ２（Ｃａｏ、４Ｙ□、６
）Ｃｕ２０．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、はとんと全体積が超伝導
状態になっていることが確認された。(Effect) For example, the composition TlBa2(Ca□, 7Yo, 3)Cu20y is
)Cu20. It was confirmed that each of the compositions exhibited a sharp superconducting transition at 40° C., and that after the transition, the entire volume was in a superconducting state.
（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（Ｔｌ２Ｏ
３）、酸化バリウム（Ｂａｄ）、酸化カルシウム（Ｃａ
ｂ）、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８５
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 (Tl2O) with a purity of 99.9% or more is used as a starting material.
3), barium oxide (Bad), calcium oxide (Ca
b), 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 85 minutes.
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Ｏ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、体積分率が若干低下する。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０．７
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８５０℃未満で
は反応が進まず優れた超伝導特性は得られない。また９
１０℃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 O. 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 0.7
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, if the temperature is lower than 850° C., the reaction does not proceed and excellent superconducting properties cannot be obtained. Also 9
When the temperature exceeds 10°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が変化し、
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 continuously changes Tc depending on the value of X,
Moreover, it exhibits a sharp superconducting transition, making it extremely practical as a superconducting material.
Claims (2)
＿２Ｏ＿ｙと表した酸化物超伝導体組成物において０．
１≦ｘ≦０．７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)Cu
In the oxide superconductor composition expressed as _2O_y, 0.
An oxide superconductor composition characterized in that 1≦x≦0.7.
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、８５０℃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 850°C to 910°C. .
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63281912A JPH02129028A (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 |
|---|---|---|---|
| JP63281912A JPH02129028A (en) | 1988-11-07 | 1988-11-07 | Oxide superconductor composition and production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02129028A true JPH02129028A (en) | 1990-05-17 |
Family
ID=17645685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63281912A Pending JPH02129028A (en) | 1988-11-07 | 1988-11-07 | Oxide superconductor composition and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02129028A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0543234A (en) * | 1991-08-09 | 1993-02-23 | Nec Corp | Oxide superconductor and production thereof |
-
1988
- 1988-11-07 JP JP63281912A patent/JPH02129028A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0543234A (en) * | 1991-08-09 | 1993-02-23 | Nec Corp | Oxide superconductor and production thereof |
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