Preparation of High Tc YBa2Cu3O7-x Powders by Citrate and Nitrate Processes

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J. Korean Ceram. Soc. > Volume 26(2); 1989 > Article

Journal of the Korean Ceramic Society 1989;26(2): 221.

Citrate, Nitrate Process에 의한 YBa2Cu3O7-x초전도 분말합성

박수련, 김윤호

한국과학기술원 정밀요업재료연구실

Preparation of High Tc YBa2Cu3O7-x Powders by Citrate and Nitrate Processes

ABSTRACT

To investigate the development and densification YBa2Cu3O7-x(1-2-3) superconducting phase, the 1-2-3 phase powders have been prepared by citrate and nitrate processes with changing calcination temperature. Nearly pure 1-2-3 phase peaks have been obtained by calcining the precursor in air at 90$0^{circ}C$ for 2.5h in citrate process but at 95$0^{circ}C$ for 2.5h in nitrate process. The sintering density of citrate derived sample calcined at 80$0^{circ}C$ has been about 4% higher than that calcined at 90$0^{circ}C$, although the compacting density has been lower at 80$0^{circ}C$ calcination. This can be explained that the 1-2-3 phase particles formed at 80$0^{circ}C$ have reactive sub-micron size which has good sinterbililty.