Abstract

Complex phosphates CsMg1 − xMxPO4 (M = Mn, Co, Cu, Zn), containing cesium and metals in the oxidation state +2, have been synthesized, and their structure and thermal behavior have been studied. Continuous solid solutions (0 ≤ x ≤ 1) of the β-tridymite structure type are formed in the CsMg1 − xMnxPO4, CsMg1 − xCoxPO4, and CsMg1 − xZnxPO4 systems, whereas limited solid solutions (0 ≤ x ≤ 0.4) are formed in the CsMg1 − xCuxPO4 system. Based on DTA data, phase transitions have been revealed in the cobalt-, copper-, and zinc-containing phosphates, and the orthorhombic or monoclinic crystal system has been identified. Unit cell parameters of the solid solutions have been calculated. Thermal expansion of the CsMPO4 phosphates has been studied.

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