Tridymite Type Phosphates of Cesium and Divalent Metals: Synthesis and Characterization of Powder and Ceramic Samples

The phase formation regularities of trydimite-type solid solutions CsMg1-xMexPO4 (Me = Mn, Co, Zn, Cu) were studied, and the dependences of the unit cell parameters on their compositions x were revealed. The thermal expansion of some double phosphates CsMePO4 (Me = Mg, Co, Mn, Zn) was investigated by high-temperature X-ray powder diffraction. The samples expand anisotropically and belong to high-thermal expansion materials. Single- phase stuffed CsMgPO4-based ceramic (density about 95−97% of theoretical value) was obtained. A leaching rate of approximately 310−4 gcm−2d−1 for Cs was determined with statical leaching of prepared ceramic.