The Improvement and Kinetics of SRS Process for Synthesis of Y1Ba2Cu3O7 and Related Superconductors

Shu-En Hsu；Chih-Ming Li；Keun-Long Wang；Yu-Then Chang

Chinese Journal of Physics

31卷6S期（1993 / 12 / 01）

971 - 980

英文

The Spontaneous Reaction Synthesis (SRS) of Y1Ba2Cu3O7 single phase superconductor, the quickest process ever known, from metals and peroxides with Y:Ba:Cu=1:2:3 chemical stoichiometric ratio has been reported in our previous paper [1].By extending the application of SRS process, a Y1237 superconductor dispersed with x (at %) Y2115 pinning centers can be synthesized by adjusting the stoichiometric ratio of Y:Ba:Cu=(1 + 2x):(2 + x):(3 + x). Following the texture alignment by Power- Melt-Growth (PMG) technique, the synthesized YBaCuO bulk superconductor exhibits an extra-ordinary levitation force, at least five-fold stronger than that of conventionally prepared ones.It is found that oxygen pressure in the reaction chamber during SRS process plays a dominant factor to control the rate of reaction and the completeness of phase transformation. Kinetics of SRS reaction for YiBa2Cu3O7 superconductors will be proposed in this report.