【摘要】 在不同温度下热处理的Bi_1.7Pb_0.3Sb_0.1Sr₂Ca₂Cu₃Oy超导体经液氮淬火或自然降温后,分析其相结构及交流磁化率——温度关系,发现低Tc（80K）相只在840℃以下（到820℃左右）才生成,在845℃～855℃温度范围内只有高Tc（110K）相生成。据此,用高温烧结之后,快速降温,越过低Tc相生成温区,在较低温度下退火,然后用自然降温的方法制成了110K单相的Bi-Pb-Sb-Sr-Ca-Cu-O系超导体。更多还原

【Abstract】 After annealed at different temperature, quenching the Bi_1.7 Pb_0.3 Sb_0.1 Sr₂ Ca₂ Cu₃ Oy superconductors in liquid nitrogen or natural cooling in furnace, examining their crystal construction and relation of ac susceptibility and temperature, we have found that the low Tc phase is formed at temperature lower than 840℃ （but higher than 820℃）and the high Tc phase is only formed at temperature higher than 845℃. According to this discovering, wehave successfully prepared the higher Tc（110K）single phase B_1.7 Pb_0.3 Sb_0.1 Sr₂ Ca₂ Cu₃ Oy supcrconductor in followiing way: after sintcrcd at high temperature（85512）fast cooling to a low temperature （715℃）, lower than the formation temperature of low Tc phase, annealing some time then cooling to room temperature.更多还原