FORMATION REACTIONS OF THETl2Ca2Ba2Cu3O10ANDTl2Ca1Ba2Cu2O8PHASES

作     者：T.W. HUANG M.P. HUNG T.S. CHIN H.C. KU S.E. HSU 

作者机构：Department of Materials Engineering National Cheng Kung University Tainan 70100 Taiwan China Dept. of Materials Sciences & Engineering National Tsing Hua University Hsinchu 30043 Taiwan China Department of Physics National Tsing Hua University Hsinchu 30043 Taiwan China Materials R&D Center Chung Shan Institute of Sciences & Technology Lung Tang 32526 Taiwan China 

出 版 物：《Modern Physics Letters B》 

年 卷 期：1990年第4卷第13期

页      面：885-893页

学科分类：07[理学] 0702[理学-物理学] 

摘      要：Solid state formation of the superconducting phases in the Tl–Ca–Ba–Cu–O system has been studied by DTA, TGA , and XRD analyses. It was found that the formation reaction of the high T c Tl 2 Ca 2 Ba 2 Cu 3 O 10 and the low T c Tl 2 Ca 1 Ba 2 Cu 2 O 8 phases takes place at around 900°C and 840°C respectively, within a reaction time of 30 minutes. Activation energies of these reactions are found to be 50 kcal/mol and 35 kcal/mol, respectively. The use of precursor Ca 3 BaCu 3 O x yielded superconducting materials with superior characteristics as compared to those prepared from the direct mixture.