Abstract
An X-ray powder diffractometer has been equipped with a position-sensitive proportional counter and an optical microscope. This apparatus makes possible in situ microscopy and X-ray observation of the phase transition and phase relations affecting the crystal growth of homologous bismuth-based superconductors. A region of Sr-Ca-Cu-O oxide and liquid is found to exist above the decomposition temperature of Bi2(Sr,Ca)2CuOx, which is formed by the decomposition reaction of Bi2Sr2CaCu2Ox. The stable region of Bi2(Sr,Ca)2CuOx is extremely narrow at 3–7°C. The amount of liquid phase is estimated semi-quantitatively from visualized images through the optical microscope.
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