Abstract
TlBa 2Ca 2Cu 3O x (Tl-1223) powder was synthesized in O 2 from a mixture of Tl 2O 3 and Ba 2Ca 2Cu 3O x. The peritectic melting point of Tl-1223 in O 2 is 905°C. It was found that the maximum phase conversion to the Tl-1223 phase occurred at 895–900°C. A small concentration of liquid was present at that temperature. Because of the rapid kinetics of Tl-1223 formation, CaO and BaCuO 2 phases became isolated from the Tl 2O 3 and thus remained in the final microstructure. In samples heated at 895°C, the CaO and BaCuO 2 proved to be sufficiently small to act as flux-pinning sites.
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