Synthesis and Thermal Expansion of Polycrystalline Cesium Minerals

Abstract
CsAlSi2O6, CsAlGe2O6, CsFeSi2O6, CsFeGe2O6, and CsBSi2O6 were prepared by reaction of Cs2CO3 and oxides and by a base‐exchange method. The compounds were characterized by optical examination and X‐ray diffraction. Dilatometric measurements of the linear thermal expansions of the cubic silicate pollucites gave relatively low coefficients, but the expansion of the germanate analogs is considerably higher. Attempts at synthesis of CsCrSi2O6 and CsCrGe2O6 and the special nature of CsBSi2O6 are briefly described.

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