Abstract
The melting and solidification of a Bi2Sr2CaCu2O8+δcompound on Ag were studied by in-situ high-temperature x-ray analysis. Bi2Sr2CaCu2O8+δ/Ag samples were heated by the heating schedule known as ‘partial melting and slow cooling’ under a 1-100%-O2/He gas flow. A strong c-axis alignment of the Bi2Sr2CaCu2O8+δcrystals was observed at the incongruent-melting temperature where the Bi2Sr2CaCu2O8+δand the molten phase coexist. Similarly, a strong c-axis alignment was observed at the initial stage of solidification. However, the subsequent solidification of the residual molten phase caused less aligned Bi2Sr2CaCu2O8+δon Ag. An improved heating schedule is proposed which increases the critical current of Bi2Sr2CaCu2O8+δ/Ag superconducting tapes.
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