JPH0226825A - Superconducting ceramic material - Google Patents
Superconducting ceramic materialInfo
- Publication number
- JPH0226825A JPH0226825A JP63177780A JP17778088A JPH0226825A JP H0226825 A JPH0226825 A JP H0226825A JP 63177780 A JP63177780 A JP 63177780A JP 17778088 A JP17778088 A JP 17778088A JP H0226825 A JPH0226825 A JP H0226825A
- Authority
- JP
- Japan
- Prior art keywords
- superconducting
- ceramic material
- phenomenon
- superconducting ceramic
- temp
- 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
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、臨界温度Ｔｃが２４０Ｋ （−３３℃）付近
で超伝導転位を示し、電気抵抗が零となる、いわゆる超
伝導現象を示す超伝導性セラミック材料であって、特に
スカンジウム、ストロンチューム、銅。Detailed Description of the Invention <Industrial Application Field> The present invention is directed to superconductors that exhibit the so-called superconducting phenomenon in which a critical temperature Tc is around 240K (-33°C) and a superconducting dislocation occurs and the electrical resistance becomes zero. Conductive ceramic materials, especially scandium, strontium, and copper.
銀、酸素からなる新規なセラミック材料に関するもので
ある。It relates to a new ceramic material consisting of silver and oxygen.
〈従来技術〉
超伝導性材料は、バルク材として送電ケーブル、リニア
モーターカー、磁気浮上船、電力貯蔵等に、または、薄
膜としてジョセフソン素子、スクイラド、磁気センサ等
の広い用途に期待されている。<Prior art> Superconducting materials are expected to be used as bulk materials in power transmission cables, linear motor cars, magnetically levitated ships, power storage, etc., and as thin films for a wide range of applications such as Josephson devices, Squirads, magnetic sensors, etc. .
この超伝導性材料として、金属系ではＮｂ−Ｔｉ合金（
Ｔｃ； ９Ｋ） 、 Ｎ ｂ ｓ Ｓ ｎ （Ｔｃ；
１８Ｋ）、 ＶｓＧ ａ （Ｔｃ ： １５Ｋ）等が公
知である。As this superconducting material, Nb-Ti alloy (
Tc; 9K), N b s S n (Tc;
18K), VsG a (Tc: 15K), etc. are known.
また、セラミックス系ではＮ ｂ Ｎ （Ｔｃ ； １
７．６Ｋ）Ｐ ｂ Ｍ Ｏａ Ｓ ａ （Ｔｃ ： １
４Ｋ）等が公知である。In addition, in ceramics, N b N (Tc; 1
7.6K) P b M Oa S a (Tc: 1
4K) etc. are publicly known.
しかるにこれら公知の材料は、いずれもまだ臨界温度Ｔ
ｃが低く、液体ヘリウム（沸点４．２Ｋ）で冷却して臨
界温度以下とすることにより、はじめて超伝導現象を示
し、使用に供され得るものである。However, all of these known materials still have a critical temperature T
It exhibits a superconducting phenomenon and can be used for the first time by cooling it with liquid helium (boiling point 4.2 K) to a temperature below the critical temperature.
ところがこの液体ヘリウムは資源的な問題があって、コ
ストも高く、超伝導材料の実用化を阻む一因となってい
た。However, this liquid helium has resource issues and is expensive, which has been one of the factors preventing the practical application of superconducting materials.
一方、近年ではセラミック系の材料で、Ｙ。On the other hand, in recent years, ceramic materials such as Y.
Ｂａ、Ｃｕ、Ｏの四元素を主成分とする（Ｙ、 Ｂａ）
Ｃｕｂ、系酸化物が臨界温度Ｔｃ＝９０−１０ＯＫ、ま
たＢ ｉ ５ｒＣａＣｕＯ系酸化物がＴｃ＝１１０Ｋ、
Ｔｌ２ＢａＣａＣｕＯ系酸化物がＴｃ＝１２５Ｋを示し
、液体窒素（沸点７７Ｋ）を凌駕することが見出された
。The main components are Ba, Cu, and O (Y, Ba)
Cub, based oxide has critical temperature Tc = 90-10OK, and B i 5rCaCuO based oxide has Tc = 110K,
It was discovered that Tl2BaCaCuO-based oxide exhibits Tc=125K, which exceeds liquid nitrogen (boiling point 77K).
この液体窒素は液体ヘリウムに比し、はるかに安価かつ
低コストであるので超伝導材料の実用化の可能性を高め
ることができる。Since this liquid nitrogen is much cheaper and less expensive than liquid helium, it can increase the possibility of practical application of superconducting materials.
本発明は上記のセラミック材料よりも更に高い温度の臨
界温度Ｔｃを有する超伝導性セラミック材料を提供する
ことを目的とする。An object of the present invention is to provide a superconducting ceramic material having a higher critical temperature Tc than the above-mentioned ceramic materials.
〈実施例〉
出発原料としてＳＣｇＯｉ、Ｓｒ （ＯＨ）２ ’８Ｈ
２０（又は５ｒＣＯ−）、ＣｕＯ（またはＣｕ ２０
） 、 Ａ ｇ ｘ Ｏを用い、一般式
％式％）
のもとに、Ｘ、α、ｙがそれぞれ次表の値になるよう秤
量して混合し、−旦、９５０℃で仮焼した後、粉砕、成
形し、次いでこの成形物を混合ガス（酸素２Ｉ２／ｗｉ
ｎ＋窒素１．２Ｉ２／ ｗｉｎ ）中、１０３０℃の温
度で焼結したセラミック材料について、臨界温度Ｔｃを
測定した。その結果、次表に示すとおりとなった。<Example> SCgOi, Sr(OH)2'8H as starting materials
20 (or 5rCO-), CuO (or Cu 20
), Ag , pulverized and molded, and then the molded product was heated with a mixed gas (oxygen 2I2/wi
The critical temperature Tc was measured for a ceramic material sintered at a temperature of 1030°C in n+nitrogen 1.2I2/win). The results are as shown in the table below.
尚、臨界温度Ｔｃの測定はＫＥＩＴＨＬＥＹ社製の１８
１型ナノボルトメータ、 ２２０型定電流発生装置を用
いて、クライオスタット中にて四端子性抵抗測定を行な
って求めた。The critical temperature Tc was measured using KEITHLEY 18.
It was determined by performing four-terminal resistance measurements in a cryostat using a Type 1 nanovoltmeter and a Type 220 constant current generator.
以下余白
表
前夫に示される通り、
Ｓ Ｃｌ−＊ Ｓ ｒ ｘ＋ｏｒ（Ｃｕ ｌ−ｙ Ａ
ｇｙ）ＯδＧ、： ｇ イテ、０．５ ≦ｘ ≦０．９
．０．１≦ｙ ＝Ｓ０．６ （７）間テは、２３０に〜
８０にで超伝導転位を示し、抵抗が零に落ちて、いわゆ
る超伝導現象を示した。又ｙ＝Ｑでは絶縁体となり、ｙ
＞０．６では焼結しない。As shown in the margin table below, S Cl-* S r x+or(Cu l-y A
gy) OδG,: g ite, 0.5 ≦x ≦0.9
．． 0.1≦y =S0.6 (7) The interval is 230~
At 80, a superconducting dislocation occurred, and the resistance dropped to zero, indicating a so-called superconducting phenomenon. Also, when y=Q, it becomes an insulator, and y
>0.6, no sintering occurs.
尚、上記本発明のセラミック材料において、Ｓｒの一部
をバリウム（Ｂａ）、カルシウム（Ｃａ）で置換しても
その超伝導特性を損なうことはない。In addition, in the ceramic material of the present invention, even if a part of Sr is replaced with barium (Ba) or calcium (Ca), its superconducting properties are not impaired.
〈効果〉
上述のように本発明の材料は、液体窒素（沸点７７Ｋ）
以上の温度で、超伝導現象を示すものであり、低廉な冷
却媒体の使用が可能となり、かつ温度制御が容易となり
、超伝導性セラミック材料として極めて有用性が高いも
のである。<Effects> As mentioned above, the material of the present invention can be used for liquid nitrogen (boiling point 77K)
It exhibits a superconducting phenomenon at the above temperature, allows the use of an inexpensive cooling medium, and facilitates temperature control, making it extremely useful as a superconducting ceramic material.
Claims (1)
り、 Ｓｃ＿１＿−＿ｘＳｒ＿ｘ＿＋＿α（Ｃｕ＿１＿−＿ｙ
Ａｇ＿ｙ）Ｏδ［ただし、ｘ＝０．５〜０．９，ｙ＝０
．１〜０．６，α≦０．１０］の組成式で表示される超
伝導性セラミック材料。[Claims] Consisting of scandium, strontium, copper, silver, and oxygen, Sc_1_-_xSr_x_+_α(Cu_1_-_y
Ag_y) Oδ [where x=0.5 to 0.9, y=0
．． 1 to 0.6, α≦0.10].
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63177780A JPH0226825A (en) | 1988-07-16 | 1988-07-16 | Superconducting ceramic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63177780A JPH0226825A (en) | 1988-07-16 | 1988-07-16 | Superconducting ceramic material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0226825A true JPH0226825A (en) | 1990-01-29 |
Family
ID=16036980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63177780A Pending JPH0226825A (en) | 1988-07-16 | 1988-07-16 | Superconducting ceramic material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0226825A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63257125A (en) * | 1987-04-13 | 1988-10-25 | Nippon Telegr & Teleph Corp <Ntt> | Manufacture of superconductive wire |
| JPH0193465A (en) * | 1987-09-04 | 1989-04-12 | W R Grace & Co | Method and composition for forming superconductive ceramic and superconductive products |
| JPH01160829A (en) * | 1987-11-16 | 1989-06-23 | W R Grace & Co | Method for manufacture of high temperature superconductor |
| JPH01169817A (en) * | 1987-12-25 | 1989-07-05 | Fujikura Ltd | Manufacture of oxide superconductive wire |
-
1988
- 1988-07-16 JP JP63177780A patent/JPH0226825A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63257125A (en) * | 1987-04-13 | 1988-10-25 | Nippon Telegr & Teleph Corp <Ntt> | Manufacture of superconductive wire |
| JPH0193465A (en) * | 1987-09-04 | 1989-04-12 | W R Grace & Co | Method and composition for forming superconductive ceramic and superconductive products |
| JPH01160829A (en) * | 1987-11-16 | 1989-06-23 | W R Grace & Co | Method for manufacture of high temperature superconductor |
| JPH01169817A (en) * | 1987-12-25 | 1989-07-05 | Fujikura Ltd | Manufacture of oxide superconductive wire |
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