Ca(Mo,W)O4 Solid Solutions Formation in CaMoO4-CaWO4 System

Abstract

The formation of solid solutions in the CaMoO₄-CaWO₄ binary system is investigated by X-ray diffraction, Raman spectroscopy, and scanning electron microscopy methods. The intermixtures of CaMoO₄ and CaWO₄ components are sintered in 600—1200 °C temperature range (in 100 °C increments). The solidus of the CaMo_xW_(1-x)O₄ system is studied by the differential scanning calorimetry method in the x  =  0.3 … 1.0 range. CaMoO₄-CaWO₄ phase diagram is constructed up to 1550 °C. The minimal sintering temperature in order to get CaMo_xW_(1-x)O₄ solid solution is shown to be 800 °C. Cathodoluminescence study of CaMo_xW_(1-x)O₄ compounds showed higher intensity of molybdate luminescence type.