Formation process of highTcsuperconducting Bihyphen;Pbhyphen;Cahyphen;Srhyphen;Cuhyphen;O thick films via melt solidification

摘要

HighTcsuperconducting thick films Bi1.6Pb0.4Ca2Sr2Cu3Oxwere prepared by the melt solidification process. The preparation conditions were optimized to obtain films with higherTc. Rapid cooling of the molten samples to the heat treatment temperature of 855thinsp;deg;C produced superconducting films with a maximumTc(zero) of 104 K. Slow cooling of the melt declined the superconducting properties of the films because of the formation of Ca2CuO3, which may prevent the formation of the 110 K phase, during cooling through the temperature range around 900thinsp;deg;C.