YO<SUB>1.5</SUB>-CaO-CuO系の状態図

概要

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In this report, we describe the phase diagrams for the pseudo-ternary system YO<SUB>1.5</SUB>-CaO-CuO at 980°C and 1000°C in air. CaCu2O3 is formed at 1000°C but not at 980°C. Phase identification and structure analysis were done by means of powder X-ray diffraction (XRD) and transmission electron microscopy (TEM). A new ternary solid solution formulated as Y45-xCxCussOy (24<X<33) was found. The XRD and electron diffraction (ED) patterns can be indexed by assuming that the solid solution has orthorhombic structure, typically with a=10.579 b=2.835, and c=6.231[Å] for x=30. The structure is modulated one-dimensionally along a direction between [110]* and [210]*, the wavelength and the direction varying with x. The change in lattice parameter with composition is anisotropic. And the unit cell volume decreases with increasing Y content. The melting point has been determined by means of TG-DTA.
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