Tridymite type phosphates of cesium and divalent metals: synthesis and characterization of powder and ceramic samples

摘要

The phase formation regularities of trydimite-type solid solutions CsMg_(1-x)Me_xPO_4 (Me = Mn, Co, Zn, Cu) were studied, and the dependences of the unit cell parameters on their compositions χ were revealed. The thermal expansion of some double phosphates CsMePO_4 (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 CsMgPO_4-based ceramic (density about 95-97% of theoretical value) was obtained. A leaching rate of approximately 3-10~-4 g.cm~(-2)-d~(-1) for Cs was determined with statical leaching of prepared ceramic.