Abstract
X-ray powder diffraction and Rietveld full-profile analysis are used to establish the homogeneity ranges and crystalline structure of solid solutions Nd2−zCazO3−z/2 (0.0 ≤ z ≤ 0.1, space group P $$\bar {3}$$ m1) and Nd2−yCayCoO4−δ (0.7 ≤ y ≤ 1.0, space group I 4/mmm). Dependences of the unit cell parameters on the composition of solid solution Nd2−yCayCoO4−δ are obtained. It is shown that all cobaltites Nd2−yCayCoO4−δ in the temperature range of 298–1373 K in air possess virtually stoichiometric composition. Average values of thermal expansion coefficients for Nd2−yCayCoO4−δ (y = 0.8; 0.9) are calculated. An isobaric-isothermal section of the phase diagram for the 1/2Nd2O3–CaO–CoO system at 1373 K in the air has been constructed.
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