JPH02252615A - Oxide superconductor - Google Patents
Oxide superconductorInfo
- Publication number
- JPH02252615A JPH02252615A JP1071907A JP7190789A JPH02252615A JP H02252615 A JPH02252615 A JP H02252615A JP 1071907 A JP1071907 A JP 1071907A JP 7190789 A JP7190789 A JP 7190789A JP H02252615 A JPH02252615 A JP H02252615A
- Authority
- JP
- Japan
- Prior art keywords
- oxide superconductor
- earth metal
- powder
- compound
- calcined
- 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 14
- 229910052779 Neodymium Inorganic materials 0.000 claims abstract description 4
- 229910052777 Praseodymium Inorganic materials 0.000 claims abstract description 4
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 3
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 3
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 3
- 150000001875 compounds Chemical class 0.000 abstract description 11
- 239000000843 powder Substances 0.000 abstract description 8
- 239000000203 mixture Substances 0.000 abstract description 6
- 239000010949 copper Substances 0.000 abstract description 5
- 229910052784 alkaline earth metal Inorganic materials 0.000 abstract description 3
- 150000001342 alkaline earth metals Chemical class 0.000 abstract description 3
- 229910052802 copper Inorganic materials 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 abstract description 3
- 229910052761 rare earth metal Inorganic materials 0.000 abstract description 3
- 150000002910 rare earth metals Chemical class 0.000 abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 2
- 238000005245 sintering Methods 0.000 abstract description 2
- 239000005749 Copper compound Substances 0.000 abstract 1
- 238000001354 calcination Methods 0.000 abstract 1
- 150000001880 copper compounds Chemical class 0.000 abstract 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 239000000969 carrier Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052684 Cerium Inorganic materials 0.000 description 2
- 150000001721 carbon Chemical class 0.000 description 2
- 238000000921 elemental analysis Methods 0.000 description 2
- 230000005291 magnetic effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- -1 organic acid salts Chemical class 0.000 description 1
- 230000005298 paramagnetic effect Effects 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000001947 vapour-phase growth Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Inorganic Compounds Of Heavy Metals (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明は酸化物超電導体に係り、特に電子をキャリアと
するＡ ｓ Ｂ ２０ ｅ構造の電子注入型酸化物超電
導体に関する。[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an oxide superconductor, and particularly to an electron injection type oxide superconductor having an A s B 20 e structure in which electrons are used as carriers. .
（従来の技術）
ＡＢＯ構造をとるＲＥ ＡＥ
３ ２ ８ ２−１１ １＋ｘＣｕ
Ｏ（ＲＥ ＝ Ｌ ａ 、 Ｐ ｒ ｒ Ｎ ｄ ｓ
Ａ Ｅ −２Ｂ＋δ
Ｓｒ、Ｃａ）化合物は、Ｃｕ−０平面を有するため超電
導特性を示す可能性があり、研究が進められている。し
かしながらこの化合物は金属的伝導を示すものの、４．
２Ｋま・での冷却で超電導特性は示さない。この原因は
金属的伝導を生じさせるために導入されている＋６分の
酸素が、Ｃｕ−０の２次元平面性をくずしていることに
よると考えられている。(Prior art) RE AE with ABO structure 3 2 8 2-11 1+xCu
O(RE = L a , P r r N d s
Since the A E -2B+δ Sr, Ca) compound has a Cu-0 plane, it may exhibit superconducting properties, and research is progressing. However, although this compound exhibits metallic conductivity, 4.
It does not exhibit superconducting properties when cooled to 2K. The reason for this is thought to be that +6 oxygen introduced to produce metallic conduction destroys the two-dimensional planarity of Cu-0.
（発明が解決しようとする課！ｆｉ）
このようにＡ ｓ Ｂ 、２０ ｅ構造のＲＥ−ＡＥ−
Ｃｕ−０系の化合物は超電導体として期待されているに
もかかわらず、今の所、超電導特性が得られていない。(Problem to be solved by the invention! fi) In this way, A s B , 20 e structure RE-AE-
Although Cu-0-based compounds are expected to be superconductors, so far they have not achieved superconducting properties.
本発明は以上の点を考慮してなされたもので、Ａ ａ
Ｂ ２０ ｅ構造のＲＥ−ＡＥ−Ｃｕ、−Ｏ系の化合物
で新規な超電導体を得ることを目的とする。The present invention has been made in consideration of the above points, and A a
The purpose of this study is to obtain a novel superconductor using a RE-AE-Cu, -O-based compound having a B 20 e structure.
［発明の構成］
（課題を解決するための手段及び作用）本発明は、
原子比で表わした一般式
％式％
で示されるＡ ａ Ｂ ２０ ｅ構造を存する酸化物超
電導体である。なおＲＥ、Ｃｅ及びＡＥがＡサイトには
いり、ＢサイトにはＣ１４がはいることになる。[Structure of the Invention] (Means and Effects for Solving the Problems) The present invention is an oxide superconductor having an A a B 20 e structure represented by the general formula % expressed in atomic ratio. Note that RE, Ce, and AE will enter the A site, and C14 will enter the B site.
ＲＥ −Ａ Ｅ−Ｃｕ、−０系のＡ３Ｂ２０６構造の酸
化物にＲＥの置換としてＣｅを導入することにより、超
電導特性を得ることができる。これはＣｅの導入により
Ｃｕ−０２次元平面性が良好となるためと考えられる。RE-A E-Cu, superconducting properties can be obtained by introducing Ce as a replacement for RE into an oxide having an A3B206 structure based on -0. This is considered to be because the introduction of Ce improves the two-dimensional flatness of Cu-0.
なお＋３個のＲＥに代え＋４個のＣｅの導入によりＣｕ
の形式電荷が下がり、本発明超電導体は電子をキャリア
とするものに、なる。In addition, by introducing +4 Ce instead of +3 RE, Cu
The formal charge of the superconductor of the present invention decreases, and the superconductor of the present invention becomes one that uses electrons as carriers.
組成はＡ ｓ Ｂ ２０ ｅ構造が実現できれば良く、
多少のずれは構わない。その範囲がＯ≦ｙ≦１である。The composition should be as long as it can realize the A s B 20 e structure,
A slight deviation is fine. The range is O≦y≦1.
また酸素は多少６の値から減少している場合があるが、
超電導特性を発揮する範囲で許容される。Also, oxygen may have decreased somewhat from the value of 6,
It is permissible within the range that exhibits superconducting properties.
Ｃｅｆｊｌは少量でその効果を発揮するが、Ｘ〉０．５
の過剰の置換では超電導特性を得ることはできない。好
ましくは０．１≦Ｘ≦０．５である。Cefjl exerts its effect in small amounts, but X>0.5
Superconducting properties cannot be obtained with excessive substitution of . Preferably 0.1≦X≦0.5.
本発明の酸化物超電導体の作製方法と１．では、希土類
（Ｌａ、Ｐｒ、Ｎｄ、Ｃｅ） 、アルカリ土類金属（Ｓ
ｒ、Ｃａ）銅の単体または、化合物を充分に混合する。Method for producing an oxide superconductor of the present invention; 1. Then, rare earth metals (La, Pr, Nd, Ce), alkaline earth metals (S
r, Ca) Thoroughly mix copper alone or as a compound.
この化合物としては酸化物炭素塩を用いることができる
ほか、炭素塩以外の加熱により、酸化物に転化する硝酸
塩、水酸化物など、さらに有機酸塩や有機金属などを用
いても良い。As this compound, in addition to oxide carbon salts, other compounds than carbon salts, such as nitrates and hydroxides which are converted into oxides by heating, as well as organic acid salts and organic metals, may be used.
組成としてはＲＥ２□□ ｘ １＋ｙ ２Ｃ
ｅ ＡＥ Ｃｕ
０ａ （０＜ ｘ≦０．５．０≦ｙ≦１）という原子
比を満足するように混合する。この混合粉を８５０〜９
５０℃で大気中で仮焼する。この仮焼粉を粉砕後、ＩＴ
ＯＮ／ｃ−の圧力をかけて１０ｘ３０ｘ５鶴の形にプレ
ス成形したのち１０００〜１１００℃でＮ２中または大
気中で焼結する。The composition is RE2□□ x 1+y 2C
e AE Cu 0a (0<x≦0.5.0≦y≦1). Add this mixed powder to 850~9
Calcinate in air at 50°C. After crushing this calcined powder, IT
After press-forming into a 10x30x5 crane shape by applying a pressure of ON/c-, it is sintered at 1000 to 1100°C in N2 or air.
この他、スパッタリング法、ＣＶＤ法等の気相成長法等
の各種方法をとることができることはいうまでもない。Needless to say, various other methods such as sputtering, CVD, and other vapor phase growth methods can be used.
なお本発明超電導体はＹ Ｂａ２Ｃｕ３０．、、、。The superconductor of the present invention is Y Ba2Cu30. ,,,.
系等のように酸素を供給する必要がないため、酸素アニ
ール等が省略可能であり製造上有利である。Unlike other systems, it is not necessary to supply oxygen, so oxygen annealing and the like can be omitted, which is advantageous in manufacturing.
従ってシース材封入の線材形成等にも有効である。Therefore, it is also effective for forming wire rods encapsulating sheath materials.
また焼結性に優れているためＹ系等に比べ、耐水性等に
も優れている。Furthermore, since it has excellent sintering properties, it also has excellent water resistance and the like compared to Y-based materials.
（実施例）
Ｌａ Ｏ、ＣｅＯ，５ｒＣＯ、ＣｕＯの各粉末をＬａ
： Ｃｅ ： Ｓ ｒ ： Ｃｕ−１，８：０．２
：１：２の比率になるように秤量、混合し、９００℃で
２４時間大気中で仮焼した。仮焼粉を粉砕後、１０ Ｘ
３０ Ｘ ５ ｍｍの形にＩ ＴＯＮ ／ ｄの圧力
をかけてプレス成形したのち、１１００℃で２４時間Ｎ
２焼結しまた。この焼結体の元素分析を行ったところＬ
ａ Ｃｅ ５ｒＣｕ２０Ｂの組成比で１．８
０．２
あることがわかった。電気抵抗の測定及び磁化率リアが
電子であることが確認された。(Example) Each powder of La O, CeO, 5rCO, and CuO was
:Ce:Sr:Cu-1,8:0.2
: They were weighed and mixed so that the ratio was 1:2, and calcined in the air at 900° C. for 24 hours. After crushing the calcined powder, 10X
After press molding into a shape of 30 x 5 mm under a pressure of I TON / d, it was heated with N at 1100°C for 24 hours.
2 Sintered. When elemental analysis of this sintered body was performed, L
a The composition ratio of Ce 5rCu20B is 1.8
0.2 I found out that there is. Measurements of electrical resistance and magnetic susceptibility were confirmed to be electrons.
ＬａをＰｒ、Ｎｄに代えた場合及びＳｒをＣａに代えた
場合でも同様の結果を得た。Similar results were obtained when La was replaced with Pr or Nd, and when Sr was replaced with Ca.
比較例
Ｌａ Ｏ，５ｒＣＯ、ＣｕＯの各粉末をＬａ：Ｓｒ：
Ｃｕ−２：に２の比率になるように秤量、混合し、９０
０℃で２４時間大気中で仮焼した。仮焼粉を粉砕後、１
０ Ｘ ３０ Ｘ ５ ａｍの形にＩ ＴＩＮ ／ ｃ
ｄの圧力をかけてプレス成形したのち１１００℃で２４
時間酸素中で焼結した。この焼結体の元素分析を行った
ところＬａ２ＳｒＣｕ２０ であることがわかった。Comparative Example Each powder of LaO, 5rCO, and CuO was prepared as La:Sr:
Weigh and mix Cu-2 to a ratio of 90
It was calcined in the air at 0°C for 24 hours. After crushing the calcined powder, 1
ITIN/c in the form of 0 x 30 x 5 am
After press molding with a pressure of d, it was heated to 24
Sintered in oxygen for an hour. Elemental analysis of this sintered body revealed that it was La2SrCu20.
磁化率を測定した８、３ ところ常磁性だった。Magnetic susceptibility was measured 8,3 However, it was paramagnetic.
［発明の効果］
以上説明したように本発明によれば電子をキャリアとす
るＡ３Ｂ２０６
体を得ることができる。[Effects of the Invention] As explained above, according to the present invention, an A3B206 body having electrons as carriers can be obtained.
型の新規な酸化物超電導type of novel oxide superconductor
Claims (1)
ｕ＿２Ｏ＿６ただしＲＥ：Ｌａ，Ｐｒ及びＮｄの少な くとも一種 ＡＥ：Ｓｒ及びＣａの少なくとも 一種 ０＜ｘ≦０．５ ０≦ｙ≦１ で示されるＡ＿３Ｂ＿２Ｏ＿６構造を有する酸化物超電
導体。(1) General formula RE_2_-_x_-_yCe_xAE_1_+_yC expressed in atomic ratio
u_2O_6 However, RE: At least one of La, Pr, and Nd AE: At least one of Sr and Ca 0<x≦0.5 0≦y≦1 An oxide superconductor having an A_3B_2O_6 structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1071907A JPH02252615A (en) | 1989-03-27 | 1989-03-27 | Oxide superconductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1071907A JPH02252615A (en) | 1989-03-27 | 1989-03-27 | Oxide superconductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02252615A true JPH02252615A (en) | 1990-10-11 |
Family
ID=13474080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1071907A Pending JPH02252615A (en) | 1989-03-27 | 1989-03-27 | Oxide superconductor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02252615A (en) |
-
1989
- 1989-03-27 JP JP1071907A patent/JPH02252615A/en active Pending
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