JPH01183449A - Preparation of high-temperature superconducting substance - Google Patents
Preparation of high-temperature superconducting substanceInfo
- Publication number
- JPH01183449A JPH01183449A JP63003708A JP370888A JPH01183449A JP H01183449 A JPH01183449 A JP H01183449A JP 63003708 A JP63003708 A JP 63003708A JP 370888 A JP370888 A JP 370888A JP H01183449 A JPH01183449 A JP H01183449A
- Authority
- JP
- Japan
- Prior art keywords
- temperature superconducting
- preparing
- cuo
- sintering
- y2cu2o5
- 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
- 239000000126 substance Substances 0.000 title abstract 3
- 238000005245 sintering Methods 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract 3
- 238000000034 method Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 6
- 239000011812 mixed powder Substances 0.000 abstract description 4
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 abstract 2
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 abstract 2
- 150000001875 compounds Chemical class 0.000 abstract 1
- LEDMRZGFZIAGGB-UHFFFAOYSA-L strontium carbonate Chemical compound [Sr+2].[O-]C([O-])=O LEDMRZGFZIAGGB-UHFFFAOYSA-L 0.000 abstract 1
- 229910000018 strontium carbonate Inorganic materials 0.000 abstract 1
- 239000012071 phase Substances 0.000 description 6
- 239000013067 intermediate product Substances 0.000 description 5
- 239000007858 starting material Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000003746 solid phase reaction Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 238000000280 densification Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002887 superconductor Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
Landscapes
- Inorganic Compounds Of Heavy Metals (AREA)
- Superconductor Devices And Manufacturing Methods Thereof (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、高温超伝導物質の調製方法に係る。[Detailed description of the invention] [Industrial application field] The present invention relates to a method for preparing high temperature superconducting materials.
よく知られている９０Ｋａ高温超伝導物質であるＹＢａ
、Ｃｕ１０．−δの焼結体の調製方法は、■ＢａＣ０，
，Ｙ、Ｏ，，ＣｕＯを出発原料とする方法、■■の組成
粉を１回以上加熱してＹＢすＣｕ５Ｏ，−δの結晶構造
を有する粉体にし、それを出発原料とする方法■共沈法
により得た、非晶質部分の多い粉体を出発原料とする方
法。があげられる。しかし■の方法では焼結体の組織は
均一にならず、ＣｕＯが液相となシャすいため液相焼結
とを９緻密な焼結体は得られるが、超伝導物質の体積分
率が小さく、臨界電流密度（Ｊｃ）は改善されない。ま
た、■の方法では焼結体を構成する個々の粒子の結晶の
完全性は高いが、粒子それぞれの焼結する性質が低いた
めに緻密な焼結体は得られず、ＪＣも改善されない。■
の方法は、溶解度積の差によって原料を沈澱させるもの
で、不純物が入９易（、超伝導物質の体積分率も低′い
。YBa, a well-known 90Ka high temperature superconductor
, Cu10. The method for preparing the sintered body of −δ is: ■BaC0,
, Y, O, , CuO as starting materials, and method (2) in which the composition powder of (■) is heated one or more times to form a powder having a crystal structure of YBCu5O, -δ, and this is used as a starting material. A method that uses powder with a large amorphous portion obtained by a precipitation method as the starting material. can be given. However, in method (2), the structure of the sintered body is not uniform, and since CuO is not in the liquid phase, a dense sintered body can be obtained using liquid phase sintering, but the volume fraction of the superconducting material is The critical current density (Jc) is small and the critical current density (Jc) is not improved. Further, in method (2), although the crystal integrity of the individual particles constituting the sintered body is high, a dense sintered body cannot be obtained because the sintering property of each particle is low, and JC is not improved. ■
In this method, the raw materials are precipitated based on the difference in solubility product, which easily introduces impurities (and the volume fraction of the superconducting material is also low).
以上に掲げた３つの方法はいずれもＪｃの大巾な向上は
望めない。None of the three methods listed above can be expected to significantly improve Jc.
なお、これらに関する公知例としてたとえば、ジャパニ
ーズ ジャーナル オプ アプライドフイジクス ２６
巻 ５号 １９８７年 第Ｌ６１９頁からＬ６２０頁
（Ｊｐｎ、Ｊ、Ａｐｐｊ、Ｐｈｙｓ。In addition, as a publicly known example regarding these, for example, Japanese Journal Op Applied Physics 26
Volume No. 5 1987 Pages L619 to L620
(Jpn, J, Appj, Phys.
ｌ ５．ＭＢ２ １９８７ ｐ、ｐ、Ｌ６１９−Ｌ６
２０）および、日経マグロクヒル社刊二エーマテリアル
ズ１９８７年６月１日号 第２９頁から第５２頁が挙げ
られる。l 5. MB2 1987 p, p, L619-L6
20) and Ni-A Materials, June 1, 1987 issue, published by Nikkei McGloch Hill, pages 29 to 52.
高温超伝導物質のＪｃ回向上は、■高温超伝導相の体積
分率の向上、■焼結体の緻密さの向上（粒子間の結合状
Ｎ）が主な改善点であるが、上記従来技術ではどちらか
一方のみしか考慮されておらず、Ｊｃの大幅な改善は望
めなかった。The main improvements in improving the Jc times of high-temperature superconducting materials are: 1) increasing the volume fraction of the high-temperature superconducting phase, and 2) increasing the density of the sintered body (bonding N between particles). The technology only takes into account one or the other, and no significant improvement in Jc could be expected.
本発明の目的は、Ｊｃの高い超伝導体を得るために超伝
導相の高い体積分率と緻密性とを兼具する焼結体を調製
する方法を提供することにある。An object of the present invention is to provide a method for preparing a sintered body having both a high volume fraction of a superconducting phase and compactness in order to obtain a superconductor with a high Jc.
上記目的は、ＢａＣ０，、Ｃｕｂ、５ｒＣＯ＠ ａＹ８
０．を焼成した場合の中間生成物である１３ａＣｕｂ、
、Ｓ ｒｃｕｏ、ｅ Ｃｕ、Ｙ、０．を出発原料として
混合物を調製し、９００〜１０２０℃で焼成することに
よシ得られる。The above purpose is BaC0,,Cub,5rCO@aY8
0. 13aCub, which is an intermediate product when firing
, S rcuo, e Cu, Y, 0. It is obtained by preparing a mixture using as a starting material and calcining it at 900 to 1020°C.
従来の製造方法のうち、ＹＢａＩＣｕ＠０１−δを出発
原料とする場合は焼結現象を起こす駆動力が小さいため
に緻密化しないが、中間生成物を用いる場合は焼結現象
の駆動力が大きいために、粒子間で焼結しやす（、また
、安定相であるＹＢ、。Among conventional manufacturing methods, when YBaICu@01-δ is used as a starting material, the driving force that causes the sintering phenomenon is small, so densification does not occur, but when using intermediate products, the driving force for the sintering phenomenon is large. Because of this, it is easy to sinter between particles (YB, which is also a stable phase).
Ｃｕ１Ｏｙ−δが焼結後に固相反応で生成するために、
緻密で超伝導相の体積分率の高い焼結体が得られる。Since Cu1Oy-δ is generated by solid phase reaction after sintering,
A dense sintered body with a high volume fraction of superconducting phase can be obtained.
あらかじめＢ、ＣＯｌとＣｕＯをＢａ：Ｃｕｘｌ：１（
元素比）、５ｒＣＯ，とＣｕＯをＳｒ：Ｃｕ、：１ （
元素比）−Ｙ鵞Ｏｓ とＣｕＯをＹ：ＣｕＩ２：１とな
るよう秤取し充分混合後、混合粉１，２．３を得る。こ
れらの混合粉を別々に９００〜１０００℃で焼成し、Ｂ
ａＣｕ０１゜５ｒｃｕＯ，＃ Ｙ、Ｃｕ、Ｏ，を調製す
る。（中間生成物の１ｌｌａｌｌ）その後、ＢａＣｕ０
１ ：５ｒＣｕＱ 、 ｓｓ ４ ： Ｑ〜２：２まで
の間で混合し、その粉体とＹ、Ｃｕ、０．を１３ａまた
はＳｒ：Ｙ＝２：１（元素比）となるように混合し、９
００〜１０２０℃２酸素中で数時間〜数日間焼結させ、
１００’Ｃ／ｈ〜２００ ℃／ ｈで冷却する。これに
よって、焼結の初期には中間生成物の大きな焼結駆動力
を利用し緻密化を進め、中〜後期には固相反応によって
超伝導物質に転化させる。これによ）、焼結密度９５〜
９８％、７７に以上での超伝導相の体積分率７０〜１０
０チなる焼結体が得られる。B, COl and CuO were prepared in advance in Ba:Cuxl:1 (
element ratio), 5rCO, and CuO as Sr:Cu, :1 (
Element ratio) -YOs and CuO are weighed out so that the ratio of Y:CuI is 2:1 and mixed thoroughly to obtain mixed powder 1, 2.3. These mixed powders were fired separately at 900 to 1000°C, and B
Prepare aCu01°5rcuO, #Y, Cu, O,. (1llall of intermediate product) then BaCu0
1:5rCuQ, ss4:Q to 2:2, and the powder and Y, Cu, 0. 13a or Sr:Y = 2:1 (element ratio), and 9
Sintered at 00-1020°C in 2 oxygen for several hours to several days,
Cool at 100'C/h to 200°C/h. As a result, in the early stages of sintering, the large sintering driving force of the intermediate product is used to promote densification, and in the middle to late stages, it is converted into a superconducting material by solid phase reaction. ), sintered density 95~
98%, the volume fraction of the superconducting phase at 77 to 10
A sintered body of zero is obtained.
本発明によれば、焼結能力の高い中間生成物を原料とし
、まず緻密に焼結させたのち固相反応によって超伝導相
を生じさせることＫよシ、緻密で超伝導相の体積分率の
高い焼結体を得ることができる。これにより、焼結密度
９５〜９８チ、超伝導体積分率７０〜１００−なる焼結
体を得ることができた。According to the present invention, an intermediate product with high sintering ability is used as a raw material, first sintered densely, and then a superconducting phase is generated by solid phase reaction. It is possible to obtain a sintered body with high As a result, it was possible to obtain a sintered body having a sintered density of 95 to 98 cm and a superconducting volume fraction of 70 to 100 cm.
Claims (3)
温超伝導物質（Ｔｃ≧９０Ｋ）の調製方法において、Ｂ
＿ａＣｕＯ＿２，ＳｒＣｕＯ＿２，Ｙ＿２Ｃｕ＿２Ｏ＿
■をあらかじめ調製し、これらの混合物を加熱すること
によつて焼結、反応させることを特徴とする高温超伝導
物質の調製方法。1. In the method for preparing Y(B_a・Sr)_2Cu_3O_7-δ-based high-temperature superconducting material (Tc≧90K), B
_aCuO_2, SrCuO_2, Y_2Cu_2O_
(2) A method for preparing a high-temperature superconducting material, which is characterized by preparing in advance and sintering and reacting a mixture thereof by heating.
：２となるよう混合した組成粉及びそれを反応させて得
た高温超伝導物質の調製方法。2. In claim 1, B_a:Sr=4:0-2
: 2 composition powder mixed and a method for preparing a high-temperature superconducting material obtained by reacting the same.
満で加熱することを特徴とする高温超伝導物質の調製方
法。3. A method for preparing a high-temperature superconducting material, which comprises heating the powder composition according to claim 2 at a temperature of 950°C or higher and lower than 1020°C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63003708A JPH01183449A (en) | 1988-01-13 | 1988-01-13 | Preparation of high-temperature superconducting substance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63003708A JPH01183449A (en) | 1988-01-13 | 1988-01-13 | Preparation of high-temperature superconducting substance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01183449A true JPH01183449A (en) | 1989-07-21 |
Family
ID=11564845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63003708A Pending JPH01183449A (en) | 1988-01-13 | 1988-01-13 | Preparation of high-temperature superconducting substance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01183449A (en) |
-
1988
- 1988-01-13 JP JP63003708A patent/JPH01183449A/en active Pending
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