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Promotion of High-T c Phase in Te-Doped (Bi, Pb) 2 Sr 2 Ca 2 Cu 3 O y Superconductors Prepared by the Melt-Quenching Method

1991; Institute of Physics; Volume: 30; Issue: 1A Linguagem: Inglês

10.1143/jjap.30.l21

1347-4065

Takayuki Komatsu, Nozomu Tamoto, Ryuji Sato, Kazumasa Matusita, Kazuhiko Sawada, Tsutomu Yamashita,

Magnetic and transport properties of perovskites and related materials

We prepared superconducting Bi 1.6 Pb 0.4- x Te x Sr 2 Ca 2 Cu 3 O y ( x =0.1∼0.4) ceramics by the melt-quenching method and examined the effect of Te addition on the formation of the high- T c phase. It was found that the onset temperature of partial melting for the glass sample with x =0.1 was the lowest, and the formation of the high- T c phase was greatly promoted. The bulk ceramics with x =0.1 and 0.2 exhibited superconductivity with a critical temperature of 101∼103 K and a critical current density (77 K, zero magnetic field) of around 200 A/cm 2 . The main superconducting phase in the ceramics with x =0.4 was the low- T c phase.