JPH02196025A - Superconducting material - Google Patents
Superconducting materialInfo
- Publication number
- JPH02196025A JPH02196025A JP1015707A JP1570789A JPH02196025A JP H02196025 A JPH02196025 A JP H02196025A JP 1015707 A JP1015707 A JP 1015707A JP 1570789 A JP1570789 A JP 1570789A JP H02196025 A JPH02196025 A JP H02196025A
- Authority
- JP
- Japan
- Prior art keywords
- superconducting material
- superconducting
- delta
- treated
- alkali metal
- 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
- 239000000463 material Substances 0.000 title claims abstract description 33
- 239000000203 mixture Substances 0.000 claims description 5
- 239000003513 alkali Substances 0.000 claims description 2
- 229910052783 alkali metal Inorganic materials 0.000 abstract description 8
- 150000001340 alkali metals Chemical class 0.000 abstract description 8
- 229910052760 oxygen Inorganic materials 0.000 abstract description 6
- 229910052788 barium Inorganic materials 0.000 abstract description 3
- 229910052791 calcium Inorganic materials 0.000 abstract description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000843 powder Substances 0.000 abstract description 3
- 239000011812 mixed powder Substances 0.000 abstract description 2
- 229910008649 Tl2O3 Inorganic materials 0.000 abstract 1
- 235000019402 calcium peroxide Nutrition 0.000 abstract 1
- 229910052802 copper Inorganic materials 0.000 abstract 1
- 230000003292 diminished effect Effects 0.000 abstract 1
- 239000004570 mortar (masonry) Substances 0.000 abstract 1
- QTQRFJQXXUPYDI-UHFFFAOYSA-N oxo(oxothallanyloxy)thallane Chemical compound O=[Tl]O[Tl]=O QTQRFJQXXUPYDI-UHFFFAOYSA-N 0.000 abstract 1
- 229910052716 thallium Inorganic materials 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
- 230000008022 sublimation Effects 0.000 description 1
- 230000001502 supplementing effect Effects 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】
（イ）産業上の利用分野
本発明は１２０に近傍で超電導状態に入るＴＣ系の超電
導材料に関する。DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a TC-based superconducting material that enters a superconducting state near 120.
（ロ）従来の技術
昭和６３年２月２９日から３月４日にかけてスイスのイ
ンターラーケンで開催された超電導国際学会で、ＩＢＭ
のアルマーデン研究所のＰ、グランド博士がＴＩ−Ｃａ
−Ｂ ａ −Ｃｕ系の酸化物が１１８にで超電導状態に
なることを発表した。(b) Conventional technology At the International Conference on Superconductivity held in Interlaken, Switzerland from February 29 to March 4, 1988, IBM
Dr. P. Grand of Almaden Institute of TI-Ca
It was announced that -B a -Cu-based oxides become superconducting at 118 degrees.
また、Ｃ，Ｃ，トラルディ博士らによる論文（Ｓｃｉｅ
ｎｃｅ、 Ｖｏｌ、 ２４０ｐ、 ｐ、 ６３１−６３
３）に開示されるよくうに、この超電導材料はＴｌｒＣ
ａｔＢａ、Ｃｕ。In addition, a paper by Dr. C. C. Toraldi et al.
nce, Vol, 240p, p, 631-63
3), this superconducting material is TlrC
atBa,Cu.
０１゜からなる組成を有している。It has a composition of 01°.
（ハ）発明が解決しようとする課題
ところが、このＴｅ−Ｃａ−Ｂ ａ−Ｃｕの酸化物の製
造は、ＴＲの昇華温度が低く、焼成時にＴＣが昇華する
ため、非常に難しく、Ｔｌの昇華を防止しつつ焼成した
ときにも、その酸化物は焼結上変化するため、１２０に
近傍で超電導状態に入る超電導材料を得ることは困難で
あった。(c) Problems to be Solved by the Invention However, the production of this Te-Ca-B a-Cu oxide is extremely difficult because the sublimation temperature of TR is low and TC sublimates during firing. Even when sintering is performed while preventing oxidation, the oxide changes during sintering, so it has been difficult to obtain a superconducting material that enters the superconducting state near 120.
本発明はかかる背景の下に、抵抗が零となる臨界温度（
Ｔｃｅｎｄ）が１２０Ｋに近い超電導材料を提供するこ
とを目的とする。With this background in mind, the present invention was developed at a critical temperature (at which the resistance becomes zero).
The purpose of the present invention is to provide a superconducting material with a Tcend) close to 120K.
（ニ）課題を解決するための手段
本発明による超電導材料は、Ｔ ’ＪＬ（Ｃａ ＋ −
＊ Ａ ｘ ） ＊（Ｂａｔ−ｙＡ ｙ ） ｔｃ ｕ
ｓｏ ５ｏ−ａで表わされる組成を有するものである
。但し、Ａは１種以上のアルカ）含属元素であり、０≦
ｘ≦０．５． Ｏ≦ｙ≦０．５．ｘ＋ｙ＞Ｏ，Ｏ≦δ
≦１．０である。(d) Means for Solving the Problems The superconducting material according to the present invention has T'JL (Ca + -
*A x ) *(Bat-yA y ) tcu
It has a composition represented by so 5o-a. However, A is one or more alkali-containing elements, and 0≦
x≦0.5. O≦y≦0.5. x+y>O, O≦δ
≦1.0.
（ホ）作用
本発明によれば、超電導材料におけるＣａあるいはＢａ
の原子位置にアルカリ金属Ａが混入し、これにより１２
０に近傍で超電導状態に入る超電導材料が得られる。(E) Effect According to the present invention, Ca or Ba in the superconducting material
Alkali metal A is mixed into the atomic position of 12
A superconducting material that enters a superconducting state near zero is obtained.
（へ）実施例 本発明の詳細な説明し、比較例と対比する。(f) Example The present invention will be described in detail and compared with comparative examples.
［第１実施例コ
実施例においては、アルカリ金属としてＫの酸化物を用
いた。[First Example] In the first example, an oxide of K was used as the alkali metal.
第１の混合工程において、Ｔ ｊ、ＯＩｔ Ｃａ Ｏ１
＋Ｋ Ｏｗｅ Ｂ ａ Ｏ＊及びＣｕＯの粉末をモル
比０．５： ２．４ ： ０．６ ： １ ： ３で孔
外を用いて混合した。In the first mixing step, T j, OIt Ca O1
+K Owe Ba O* and CuO powders were mixed in a molar ratio of 0.5: 2.4: 0.6: 1: 3 using the outside of the hole.
第２の成型工程では、混合工程で得た混合粉末を７５０
ｋｇｆ／ｃｍ”の圧力で成型した。In the second molding process, the mixed powder obtained in the mixing process is
The molding was carried out under a pressure of "kgf/cm".
第３の熱処理工程では、成型工程で得た成型体を金箔で
包み、電気炉内で酸素雰囲気中で８７５℃、１５分間の
熱処理をし、引き続いて７５０℃で１０時間の熱処理を
施こした。成型体を金箔で包んで熱処理工程を行うこと
により、融点が７００℃程度と低いＴ ｔ ＝ Ｏｓが
黒煙となって昇華してしまう現象が防止される。In the third heat treatment step, the molded body obtained in the molding step was wrapped in gold foil and heat treated at 875°C for 15 minutes in an oxygen atmosphere in an electric furnace, followed by heat treatment at 750°C for 10 hours. . By wrapping the molded body in gold foil and performing the heat treatment process, it is possible to prevent T t =Os, which has a low melting point of about 700° C., from sublimating into black smoke.
この熱処理工程においては、Ｔ ｌ ｔ ｏ ｓのみが
溶融し、その溶融液中にＣａ ０２１ Ｋ Ｏ２，Ｂ
ａ Ｏｓ及びＣｕＯが溶けだし、最終的に、１１ｇ （
Ｃａ ＋−ｍｋ、）＊ （Ｂａｔ−＋Ｋｙ）！ Ｃ
ｕ５Ｏ＋ｏ−ｔ （但し、０≦ｘ≦０．５．０≦シ゛≦
０．５． ｘ＋ｖ＞０． ０≦δ≦１゜Ｏ）で表わさ
れる超電導材料が得られた。In this heat treatment step, only T l t o s is melted, and Ca 021 K O 2 , B
a Os and CuO begin to dissolve, and finally 11g (
Ca +-mk, )* (Bat-+Ky)! C
u5O+o-t (However, 0≦x≦0.5.0≦shi≦
0.5. x+v>0. A superconducting material having the following formula (0≦δ≦1°O) was obtained.
実施例で得られた超電導材料の電気抵抗−温度特性を西
端ｒ法で測定したところ、第１図に示す特性を得た。こ
の特性から明らかなように１２０にで超電導状態に入る
ことがわかる。また、実施例Ｃｆ’％た超電導材料のＸ
線回折パターンを第２図に示す。このパターンから超電
導材料における超電導相の体積パーセントが多いことが
わかる。この超電導材料の溝造図を第３図に示す。The electrical resistance-temperature characteristics of the superconducting materials obtained in the examples were measured using the Nishibata r method, and the characteristics shown in FIG. 1 were obtained. As is clear from this characteristic, the superconducting state is reached at 120°C. In addition, X of the superconducting material with Example Cf'%
The line diffraction pattern is shown in FIG. This pattern shows that the superconducting material has a high volume percent of superconducting phase. A groove diagram of this superconducting material is shown in FIG.
この実施例において、仕込み組成からｘ 十ｙ ＝０．
２である。In this example, x + y = 0.
It is 2.
［第２実施例］
第１実施例の混合工程における仕込み組成を次のように
変えた。すなわち、ＴＬＯ，、ＣａＯ！、ＫＯ，Ｂａ１
ｔ及びＣｕＯの粉末をモル比０゜５ ： １．８ ：
１．２ ： １．３とした。[Second Example] The charging composition in the mixing step of the first example was changed as follows. That is, TLO,,CaO! ,KO,Ba1
The molar ratio of t and CuO powders was 0°5:1.8:
1.2: 1.3.
この仕込み組成を変えた点を除いて、第１実施例と同じ
条件で超電導材料を作製した。この第２実施例ではｘ＋
ｙ＝０．４である。第２実施例で得た超電導材料は１１
３にで超電導状態に入ることを確認した。A superconducting material was produced under the same conditions as in the first example except that the charging composition was changed. In this second embodiment, x+
y=0.4. The superconducting material obtained in the second example was 11
It was confirmed that the superconducting state entered in step 3.
以上の実施例においては、Ｃａｂ、、Ｂａｄ、及びＫＯ
，で表わされるＣａ、Ｂａ及びＫの酸化物を用いたが、
Ｃａｂ、ＢａＯ及びに、０．、に、０゜又はに、０で表
わされる酸化物を用いてもよい。In the above examples, Cab, Bad, and KO
We used Ca, Ba and K oxides represented by ,
Cab, BaO and 0. An oxide represented by , 0° or , 0 may be used.
また、Ｃａ ＣＯｍ＋ Ｂ ａ ＣＯ、及びＫ ＊
ＣＯｓで表わされる炭酸塩を用いることもでき、さらに
に以外の他のアルカリ金属（Ｌｉ、Ｎａ、Ｒｂ、Ｃｓ）
の酸化物や炭酸塩を用いることもできる。In addition, Ca COm + B a CO, and K *
Carbonates represented by COs can also be used, and furthermore, other alkali metals (Li, Na, Rb, Cs)
It is also possible to use oxides and carbonates of.
［比較例］
第１実施例の混合工程において、ＫＯ，を用いることな
く、また、他のアルカリ金属の酸化物又は炭酸塩を用い
ない点を除いて、第１実施例と同じ条件で超電導材料を
作成した。この超電導材料は１１２にで超電導状態に入
ることを確認した。[Comparative Example] Superconducting materials were prepared under the same conditions as in Example 1, except that KO was not used in the mixing step of Example 1, and other alkali metal oxides or carbonates were not used. It was created. It was confirmed that this superconducting material entered a superconducting state at 112 hours.
この比較例と各実施例を比較すると、アルカリ金属を有
する超電導材料は、アルカリ金属を有しない超電導材料
に比し、超電導状態に入る温度を高めることができ、ま
た、ｘ＋ｙ−０，２のときに超電導状態に入る温度を一
層高めることができる。Comparing this comparative example with each example, the superconducting material containing an alkali metal can raise the temperature at which it enters a superconducting state compared to the superconducting material without an alkali metal, and when x + y - 0,2 The temperature at which the superconducting state is reached can be further increased.
実施例において用いた超電導材料の素材には、超電導特
性を示すために必要な酸素量を充分に含んでいるので、
シース材に超電導素材を封入した状態で熱処理すること
によって、外部から酸素を補給することなく、超電導材
料を線材化することができ、本発明が超電導材料の線材
化に寄与するところは大きい。The superconducting material used in the examples contains a sufficient amount of oxygen necessary to exhibit superconducting properties.
By heat-treating the superconducting material encapsulated in the sheath material, the superconducting material can be made into a wire without externally supplementing oxygen, and the present invention greatly contributes to making the superconducting material into a wire.
（ト）発明の効果
本発明は、ＴＩ系超超電導材料アルカリ金属を添加して
超電導材料を構成するため、１２０に近傍で超電導状態
に入る超電導材料を得ることができる。(G) Effects of the Invention In the present invention, since a superconducting material is formed by adding an alkali metal to a TI-based superconducting material, a superconducting material that enters a superconducting state near 120 can be obtained.
第１図は本発明の実施例で得た超電導材料の電気抵抗−
温度特性図、第２図はその超電導材料のＸ線回折パター
ン、第３図はその超電導材料の購造図である。Figure 1 shows the electrical resistance of the superconducting material obtained in the example of the present invention.
A temperature characteristic diagram, FIG. 2 is an X-ray diffraction pattern of the superconducting material, and FIG. 3 is a purchasing diagram of the superconducting material.
Claims (1)
１＿−＿ｙＡｙ）＿２Ｃｕ＿３Ｏ＿１＿０＿−＿δで表
わされる組成を有する超電導材料。 但し、Ａは１種以上のアルカリ含属元素であり、０≦ｘ
≦０．５，０≦ｙ≦０．５，ｘ＋ｙ＞０，０≦δ≦１．
０である。(1) Tl_2(Ca_1_-_xAx)_2(Ba_
A superconducting material having a composition represented by 1_-_yAy)_2Cu_3O_1_0_-_δ. However, A is one or more alkali-containing elements, and 0≦x
≦0.5, 0≦y≦0.5, x+y>0, 0≦δ≦1.
It is 0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1015707A JPH02196025A (en) | 1989-01-24 | 1989-01-24 | Superconducting material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1015707A JPH02196025A (en) | 1989-01-24 | 1989-01-24 | Superconducting material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02196025A true JPH02196025A (en) | 1990-08-02 |
Family
ID=11896239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1015707A Pending JPH02196025A (en) | 1989-01-24 | 1989-01-24 | Superconducting material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02196025A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993010047A1 (en) * | 1991-11-13 | 1993-05-27 | Midwest Superconductivity, Inc. | Method of fabricating thallium-containing ceramic superconductors |
| US5306698A (en) * | 1991-10-10 | 1994-04-26 | International Business Machines Corporation | Methods for producing Tl2 Ca2 Ba2 Cu3 oxide superconductors |
| JPH0753212A (en) * | 1993-08-13 | 1995-02-28 | Agency Of Ind Science & Technol | High temperature superconductor and its production |
-
1989
- 1989-01-24 JP JP1015707A patent/JPH02196025A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5306698A (en) * | 1991-10-10 | 1994-04-26 | International Business Machines Corporation | Methods for producing Tl2 Ca2 Ba2 Cu3 oxide superconductors |
| WO1993010047A1 (en) * | 1991-11-13 | 1993-05-27 | Midwest Superconductivity, Inc. | Method of fabricating thallium-containing ceramic superconductors |
| US5332721A (en) * | 1991-11-13 | 1994-07-26 | Midwest Superconductivity, Inc. | Method of fabricating thallium-containing ceramic superconductors |
| JPH0753212A (en) * | 1993-08-13 | 1995-02-28 | Agency Of Ind Science & Technol | High temperature superconductor and its production |
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