Abstract
The subsolidus phase relations of the Bi 2O 3Nd 2O 3CuO ternary system and its binary systems along with crystallographic parameters of the compounds were investigated by X-ray powder diffraction and differential thermal analysis. The room temperature section of the phase diagram of the Bi 2O 3Nd 2O 3CuO system can be divided into two diphase regions and six triphase regions. No ternary compound was found. There exist two solid solutions (α, β) and a compound Bi 0.55Nd 0.45O 1.5 in the (Bi 2O 2) 1 − x (Nd 2O 3) x system. Both solid solution α (0.05≤ x≤0.30) and β (0.53≤ x≤0.73) belong to the rhombohedral system ( R 3m ). The lattice parameters represented by a hexagonal cell are a = 3.9832(4), c = 27.536(5) A ̊ for Bi 0.8Nd 0.2O 1.5 (α phase) and a = 3.8826(3), c = 9.727(1) A ̊ for Bi 0.4Nd 0.8O 1.5 (β phase). The Bi 0.55Nd 0.45O 1.5 compound crystallizes in a face-centered cubic (f.c.c.) lattice with a = 5.5480(2) A ̊ .
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