Abstract
Solidification of Y 1.5Ba 2Cu 3O x system was studied with the aim to find the temperature of self-nucleation. The microstructure after cooling from isothermal dwells in the temperature range 984–995 °C was analysed. It is shown that blocky YBa 2Cu 3O 7−δ crystals were self-nucleated and grown during isothermal dwells below 988 °C and spheroidal multicrystals were formed during cooling from isothermal dwells at higher temperatures. The symmetrical and radial YBa 2Cu 3O 7−δ crystal branches of spheroids grow in the 〈110〉 crystal direction.
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