JPH02221125A - Oxide superconductor and its production - Google Patents
Oxide superconductor and its productionInfo
- Publication number
- JPH02221125A JPH02221125A JP1040003A JP4000389A JPH02221125A JP H02221125 A JPH02221125 A JP H02221125A JP 1040003 A JP1040003 A JP 1040003A JP 4000389 A JP4000389 A JP 4000389A JP H02221125 A JPH02221125 A JP H02221125A
- Authority
- JP
- Japan
- Prior art keywords
- superconductor
- oxide
- oxide superconductor
- composition
- present
- 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
- 239000002887 superconductor Substances 0.000 title claims abstract description 45
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 abstract description 5
- 230000001747 exhibiting effect Effects 0.000 abstract description 2
- 239000010409 thin film Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 239000001307 helium Substances 0.000 description 3
- 229910052734 helium Inorganic materials 0.000 description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910014454 Ca-Cu Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005292 diamagnetic effect Effects 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic 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
Landscapes
- Inorganic Compounds Of Heavy Metals (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Superconductor Devices And Manufacturing Methods Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、酸化物超電導体に関する。より詳細には、液
体ヘリウムの沸点（４，２Ｋ＞において、充分な超電導
特性を示す酸化物超電導体に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to oxide superconductors. More specifically, the present invention relates to an oxide superconductor that exhibits sufficient superconducting properties at the boiling point of liquid helium (4,2 K>).
従来の技術
１９８６年末に、ベトノル’７（Ｂｅｄｎｏｒｚ）およ
びミニラー（Ｍｕｌｌｅｒ）等により、Ｌａ−Ｂａ−Ｃ
ｕ系の従来の金属系超電導体等と比較して極めて高い臨
界温度を有する酸化物超電導体が発見されて以来、より
優れた超電導物質の探索が続けられている。１９８７年
に、Ｙ＝Ｂａ−Ｃｕ系の超電導体が９０にという液体窒
素温度以上の臨界温度を有していることが見出され、こ
れをもって高温超電導体の探索は一段落したかにみえた
が、科学技術庁金属材料研究所の前出等により１００に
以上で超電導現象の兆候を呈するＢｉ −５ｒ −Ｃａ
−Ｃｕ系の超電導体が発見されるに及んで、再び新しい
高温超電導物質を模索する試みが盛んになっている。そ
の結果、１２０に級の臨界温度を有するものとみられる
ＴＩ −Ｂａ−Ｃａ−Ｃｕ系の超電導体が、１９８８年
２月のヒユーストンにおけるアーカンサス（Ａｒｋａｎ
ｓａｓ）大学により発表され、注目されている。Prior Art At the end of 1986, Bednorz and Muller et al.
Since the discovery of an oxide superconductor having an extremely high critical temperature compared to conventional U-based metallic superconductors, the search for superior superconducting materials has continued. In 1987, it was discovered that a Y=Ba-Cu superconductor has a critical temperature of 90°C, which is higher than the liquid nitrogen temperature, and with this, the search for high-temperature superconductors seemed to have come to an end. , Bi-5r-Ca exhibiting signs of superconductivity at 100 or higher
With the discovery of -Cu-based superconductors, attempts to find new high-temperature superconducting materials are once again gaining momentum. As a result, a TI-Ba-Ca-Cu superconductor, which is believed to have a critical temperature of about 120°C, was discovered in February 1988 at Hyuston in Arkansas.
sas) was announced by the university and is attracting attention.
しかしながら、酸化物超電導体における超電導機構は、
未だに解明されておらず、どのような組成の物質が高温
超電導体になるか、現在のところ予測不可能である。However, the superconducting mechanism in oxide superconductors is
This remains to be elucidated, and it is currently impossible to predict what composition of materials will become high-temperature superconductors.
発明が解決しようとする課題
従来の酸化物超電導体は、臨界温度こそ高いが、臨界電
流密度が小さく、大きな電流が流せない。Problems to be Solved by the Invention Conventional oxide superconductors have high critical temperatures, but have low critical current densities and cannot carry large currents.
また、可撓性に欠けているため、加工が困難であった。In addition, it was difficult to process because of its lack of flexibility.
さらに特にＹ−Ｂａ−Ｃｕ−０系、Ｌａ−Ｂａ −Ｃｕ
−Ｑ系およびＬａ−３ｒ −Ｃｕ−Ｑ系の酸化物超電導
体は、化学的に不安定であり、超電導特性が長期間維持
できない。また、Ｂｉ −３ｒ −Ｃａ−Ｃｕ−０系お
よびＴＩ −Ｂａ −Ｃａ−Ｃｕ −０系酸化物超電導
体は、臨界温度の高い相を得るための製造条件の幅が狭
く、所望の物質がなかなか得られない。さらにＴ１は、
毒性が高いだけでな（、揮発性もあるため、製造設備も
特別なものを使用する必要があった。More particularly, Y-Ba-Cu-0 system, La-Ba-Cu
-Q-based and La-3r-Cu-Q-based oxide superconductors are chemically unstable and cannot maintain superconducting properties for a long period of time. In addition, for Bi-3r-Ca-Cu-0-based and TI-Ba-Ca-Cu-0 based oxide superconductors, the range of manufacturing conditions for obtaining a phase with a high critical temperature is narrow, making it difficult to obtain the desired material. I can't get it. Furthermore, T1 is
Not only is it highly toxic, but it is also volatile, so special manufacturing equipment had to be used.
そこで、本発明の目的は、上記従来の酸化物超電導体の
問題点を解決する可能性のある、新規な超電導体を提供
することにある。Therefore, an object of the present invention is to provide a novel superconductor that may solve the problems of the conventional oxide superconductors.
課題を解決するための手段
本発明に従うと、下記の式
％式％
をそれぞれ満たす数を表す。〕
で示される組成の複合酸化物を含有することを特徴とす
る酸化物超電導体が提供される。Means for Solving the Problems According to the present invention, % represents a number that satisfies each of the following formulas. ] There is provided an oxide superconductor characterized by containing a composite oxide having the composition shown below.
また、上記組成の複合酸化物を含有する酸化物超電導体
を製造する方法として、Ｌａ、 ＳｒおよびＮｂそれぞ
れの酸化物または炭酸塩を混合し、８００℃〜１２００
℃の温度において、弱還元雰囲気中で熱処理することを
特徴とする酸化物超電導体の製造方法が提供される。In addition, as a method for producing an oxide superconductor containing a composite oxide having the above composition, oxides or carbonates of La, Sr, and Nb are mixed and heated at 800°C to 1200°C.
Provided is a method for producing an oxide superconductor, characterized in that heat treatment is performed in a weakly reducing atmosphere at a temperature of .degree.
作用
本発明の酸化物超電導体は、従来の酸化物超電導体には
必ず含まれていたＣｕを全く含まない新規な組成の複合
酸化物で構成される。本発明の酸化物超電導体の現在測
定されている臨界温度は約１２にであり、冷媒として液
体ヘリウムを使用する場合、充分な超電導特性を示す。Function The oxide superconductor of the present invention is composed of a composite oxide having a novel composition that does not contain any Cu, which is always included in conventional oxide superconductors. The currently measured critical temperature of the oxide superconductor of the present invention is about 12°C, and exhibits sufficient superconducting properties when using liquid helium as the coolant.
従来の酸化物超電導体の例から、さらに開発が進むに従
い、臨界温度が向上することも考えられる。From the example of conventional oxide superconductors, it is conceivable that the critical temperature will increase as development progresses further.
本発明の酸化物超電導体は、従来の酸化物超電導体と全
く異なる組成であるので、従来の酸化物超電導体の諸問
題を解決する可能性がある。また、未解明の酸化物超電
導体の超電導機構の解明にも役立つ。Since the oxide superconductor of the present invention has a composition completely different from that of conventional oxide superconductors, it has the potential to solve various problems of conventional oxide superconductors. It will also be useful in elucidating the unexplained superconducting mechanism of oxide superconductors.
本発明の酸化物超電導体は、
しａ、Ｓｒ、Ｎｂ、、Ｏ□
（ｘＳｙ、ｚは、
０．３≦ｘ≦２．０
１．０≦ｙ≦１０．０
１．０≦２≦３０．０
をそれぞれ満たす数を表す。〕
でその組成が示されるが、Ｘおよびｙが、０．５≦ｘ≦
１，５
１．０≦ｙ≦９．０
を満たす場合には、さらにその超電導特性が安定して好
ましい。The oxide superconductor of the present invention has the following characteristics: Shia, Sr, Nb, , O represents a number that satisfies .0 respectively.] The composition is shown by
1,5 If 1.0≦y≦9.0 is satisfied, the superconducting properties are more stable, which is preferable.
本発明の方法では、上記の酸化物超電導体を製造するの
に、原料としてＬａ、 ＳｒおよびＮｂそれぞれの酸化
物または炭酸塩を用いる。具体的には、Ｌａ２０．、５
ｒＯ１ＳｒＣＯ３、ＮｂｚＯｓ等を用いる。これらの原
料粉末を混合し、弱還元雰囲気で焼結等の熱処理を行う
。この熱処理温度を８００℃以上１２００℃以下とする
のは、８００℃未満では原材料の反応が十分でなく超電
導体が形成されず、１２００℃を超える温度では部分的
な融解や酸素の解離が起こるためである。また、弱還元
雰囲気とするのは、Ｎｂの酸化度すなわちイオン価数を
適切な状態に調整するためである。In the method of the present invention, oxides or carbonates of La, Sr, and Nb are used as raw materials to produce the above-mentioned oxide superconductor. Specifically, La20. , 5
rO1SrCO3, NbzOs, etc. are used. These raw material powders are mixed and subjected to heat treatment such as sintering in a weakly reducing atmosphere. The reason why this heat treatment temperature is set at 800°C or more and 1200°C or less is because if it is less than 800°C, the reaction of the raw materials will not be sufficient and a superconductor will not be formed, and if the temperature exceeds 1200°C, partial melting or dissociation of oxygen will occur. It is. Furthermore, the reason for creating a weakly reducing atmosphere is to adjust the degree of oxidation of Nb, that is, the ion valence, to an appropriate state.
以下、本発明を実施例により、さらに詳しく説明するが
、以下の開示は本発明の単なる実施例に過ぎず、本発明
の技術的範囲をなんら制限するものではない。EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples, but the following disclosure is merely an example of the present invention and does not limit the technical scope of the present invention in any way.
に真空封入し、炉内温度１０００℃で９４時間焼結した
。The sample was sealed in vacuum and sintered at a furnace temperature of 1000°C for 94 hours.
各ペレットの組成を第３図に図示する。The composition of each pellet is illustrated in FIG.
第１表 実施例 本発明の方法で、本発明の酸化物超電導体を製造した。Table 1 Example The oxide superconductor of the present invention was manufactured by the method of the present invention.
原料として、Ｌａ２０ａ、ＳｒＯまたは５ｒＣＯ＋、Ｎ
ｌ］２０Ｓの各粉末をＬａ：Ｓｒ：Ｎｂの比が、第１表
に示した各割合になるよう混合し、約１００ｋｇ／ｃｒ
ｌでそれぞれペレット成形した。各ペレットを石英管中
上記の方法で作製′した焼結体のうち■■■■■にふい
て、第１図に示すように、約１２に付近に電気抵抗の急
激な減少がみられ、また、第２図に示すように１２．５
に程度からマイスナー効果による反磁性の信号を観測し
た。以上によって、上記の方法で作製した酸化物が超電
導体であることを確認した。As raw materials, La20a, SrO or 5rCO+, N
l] Each powder of 20S was mixed so that the ratio of La:Sr:Nb was as shown in Table 1, and about 100kg/cr was mixed.
Each pellet was formed into a pellet using 1. Of the sintered bodies produced by the method described above, each pellet was placed in a quartz tube, and as shown in Figure 1, a sharp decrease in electrical resistance was observed around 12. Also, as shown in Figure 2, 12.5
A diamagnetic signal due to the Meissner effect was observed to a certain degree. From the above, it was confirmed that the oxide produced by the above method was a superconductor.
発明の効果
本発明に従うと、Ｃｕを含まない新規な酸化物超電導体
およびその製造方法が提供される。本発明により得られ
る酸化物超電導体は、液体ヘリウムの沸点（４，２Ｋ）
において充分な超電導特性を示す。Effects of the Invention According to the present invention, a novel oxide superconductor that does not contain Cu and a method for producing the same are provided. The oxide superconductor obtained by the present invention has a boiling point of liquid helium (4.2K).
It exhibits sufficient superconducting properties.
さらに、本発明に従う酸化物超電導体は、薄板材、細線
材あるいは小部品として直接使用可能なだけでなく、ス
パッタリング等により薄膜として作製することによって
各種の電子技術分野に応用することもできる。また、全
く新規な物質のため酸化物超電導体の超電導機構の解明
にも役立つ。Furthermore, the oxide superconductor according to the present invention can not only be used directly as a thin plate material, thin wire material, or small part, but also can be applied to various electronic technology fields by being produced as a thin film by sputtering or the like. Furthermore, since it is a completely new material, it will also be useful in elucidating the superconducting mechanism of oxide superconductors.
変度化のグラフである。It is a graph of variation.
第３図は、実施例で作製した試料の組成を示す図である
。FIG. 3 is a diagram showing the composition of samples prepared in Examples.
Claims (1)
ｚは、 ０．３≦ｘ≦２．０ １．０≦ｙ≦１０．０ １．０≦ｚ≦３０．０ をそれぞれ満たす数を表す。〕 で示される組成の複合酸化物を含有することを特徴とす
る酸化物超電導体。 （２）上記ｘおよびｙが、 ０．５≦ｘ≦１．５ １．０≦ｙ≦９．０ を満たす組成であることを特徴とする請求項（１）に記
載の酸化物超電導体。 （３）請求項（１）または（２）に記載の組成の複合酸
化物を含有する酸化物超電導体を製造する方法において
、Ｌａ、ＳｒおよびＮｂそれぞれの酸化物または炭酸塩
を混合し、８００℃〜１２００℃の温度において、弱還
元雰囲気中で熱処理することを特徴とする酸化物超電導
体の製造方法。[Claims] Formula (1): La_1Sr_xNb_yO_z [x, y,
z represents a number that satisfies the following, respectively: 0.3≦x≦2.0, 1.0≦y≦10.0, 1.0≦z≦30.0. ] An oxide superconductor characterized by containing a composite oxide having the composition shown below. (2) The oxide superconductor according to claim (1), wherein x and y have a composition satisfying the following: 0.5≦x≦1.5 1.0≦y≦9.0. (3) In a method for manufacturing an oxide superconductor containing a composite oxide having the composition according to claim (1) or (2), oxides or carbonates of La, Sr, and Nb are mixed, 1. A method for producing an oxide superconductor, comprising heat-treating in a weakly reducing atmosphere at a temperature of 1200°C to 1200°C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1040003A JPH02221125A (en) | 1989-02-20 | 1989-02-20 | Oxide superconductor and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1040003A JPH02221125A (en) | 1989-02-20 | 1989-02-20 | Oxide superconductor and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02221125A true JPH02221125A (en) | 1990-09-04 |
Family
ID=12568739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1040003A Pending JPH02221125A (en) | 1989-02-20 | 1989-02-20 | Oxide superconductor and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02221125A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6503296B1 (en) | 1998-05-20 | 2003-01-07 | Norsk Hydro Asa | Membrane and use thereof |
| US7566411B2 (en) * | 2005-10-17 | 2009-07-28 | Lg Chem, Ltd. | Composite oxides comprising strontium, lantanium, yttrium and ionic conductors using the same |
| US7591966B2 (en) * | 2005-10-19 | 2009-09-22 | Lg Chem, Ltd. | Composite oxides comprising strontium, lantanium, tungsten and ionic conductors using the same |
-
1989
- 1989-02-20 JP JP1040003A patent/JPH02221125A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6503296B1 (en) | 1998-05-20 | 2003-01-07 | Norsk Hydro Asa | Membrane and use thereof |
| US7566411B2 (en) * | 2005-10-17 | 2009-07-28 | Lg Chem, Ltd. | Composite oxides comprising strontium, lantanium, yttrium and ionic conductors using the same |
| US7591966B2 (en) * | 2005-10-19 | 2009-09-22 | Lg Chem, Ltd. | Composite oxides comprising strontium, lantanium, tungsten and ionic conductors using the same |
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