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Effects of Foreign Substances Si and Ca on Superconductivity of YBa_2Cu_3O_(7-δ)

Tang Gongben Cui Shuojing Chen Jiuzan Ma Xianfeng Xie Yunfen Shi Changhuai Ni Jiazan (Changchun Institute of Applied Chemistry,Academia Sinica)  
Through the measurement of J_c, T_c,X-ray powder diffraction and SEM anal-yses,TGA and TMA,valence state analysis of copper,oxygen content analysisand stability measurement for YBa_2Cu_3O_(7-δ) doped with Si,Ca,it is proved thatforeign substance Ca is beneficial to raising J_c,strengthening the bond of structureparticles,reducing the amount of loss oxygen and raising the stability,while theeffect of foreign substance Si is contrary to that of Ca.
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