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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 36, Number 6
JKCSEZ 36(6)
December 20, 1992 

 
Title
High Tc Superconductors LnBa2Cu3O7-δ from 2-Ethylhexanoate Precursors

2-Ethylhexanoate 화합물에서 제조한 고온초전도체 LnBa2Cu3O7-δ
Author
Jung Ohk Kweon, Soon Bok Hong, Sung Uhk Lee, Jung Sik Oh, Won Yang Chung

권정옥, 홍순복, 이성욱, 오정식, 정원양
Keywords
Abstract
Y, Er, Yb, Ba 및 Cu를 각각 포함하는 유기금속 화합물인 2-Ethylhexanoate 화합물을 합성하였다. 합성된 유기금속화합물들은 모두 공통용매에 녹아 균일혼합물을 형성하였으며 이들을 원료물질로 하여 고온초전도체 YBa2Cu3O7-δ(Y123), ErBa2Cu3O7-δ(Er123) 및 YbBa2Cu3O7-δ(Yb123)를 제조하였다. X-선 회절분석결과 이들은 단일상이 아니었으며 YBa2Cu4O8(Y124)를 포함한 약간씩의 불순물상을 포함하고 있었고, 이것은 자화율 측정에서도 확인되었다. Ceramic method로 제조한 시료에 비하여 임계온도가 대체로 높았으며, 부피반자성자화율은 큰 변화가 없는 것으로 판단된다.

2-Ethylhexanoate compounds which contained Y, Er, Yb, Ba, and Cu were prepared separately. These metallo-organic compounds were dissolved together in the common solvent and the solution was homogeneous. From these solution, high Tc superconductors YBa2Cu3O7-δ(Y123), ErBa2Cu3O7-δ(Er123), and YbBa2Cu3O7-δ(Yb123) were prepared. XRD analysis showed that these superconductors were not single phase and contained some impurity phases including YBa2Cu4O8(Y124). This was also confirmed from the magnetic susceptibility measurement. Generally, critical temperatures were higher than that of the superconductors prepared by ceramic method. Volume diamagnetic susceptibility showed little variation compared to the specimen made by ceramic method.

Page
818 - 823
Full Text
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