Bi2212超导化合物中碳含量及其影响

Carbon Contents and Its Effects on the Bi2212 Superconductive Compounds

】通过在不同的气氛下高温热处理Ｂｉ２２１２相的超导样品，发现随块材中Ｃ杂质含量的增加，其熔化温度由８６５℃下降到８５０℃，同时其超导电性能下降。高温热处理之后，用离心浇铸法制备的Ｂｉ２２１２圆筒显示一定的超导电性（～４０Ａ／ｃｍ３），其超导电性能随Ｃ含量降低而增强。为避免圆筒在高温下变形。

To treated the Bi2212 bulk materials under the different gases by high temperature. The result indicates that the melting temperature of the Bi2212 materials decrease from 865℃ to 850℃, and its the superconductive properties get down seriously with the increasement of the impurity of carbon. After annealed. the Bi2212 tubes made by the centrifugal casting method show some superconductivity (～40A/cm 2) under the low carbon content. In order to avoid the changing of its style, the treatment temperature is suitable nearly 810℃。