Abstract
Orthophosphates Ca0.5Ti2(PO4)3, Ca0.5Zr2(PO4)3, Ca0.75Zr2(SiO4)0.5(PO4)2.5, and CaMg0.5Zr1.5(PO4)3 (structural type NaZr2(PO4)3), having different occupancies of interframework positions by calcium, have been prepared by the sol-gel method with the subsequent thermal treatment of dried gels and investigated by IR spectroscopy and X-ray diffraction. The analytical indexing of X-ray diffraction patterns is performed within the sp. gr. \(R\bar 3\). High-temperature X-ray diffraction was used to investigate the behavior of the orthophosphates upon heating: thermal expansion in the temperature range of 20–610°C (up to 500°C for Ca0.5Zr2(PO4)3). The coefficients of thermal expansion are calculated from the shift of diffraction peaks. The unit-cell parameters of crystals at different temperatures are determined. The dependences of thermal expansion and its anisotropy on the occupancy of cation M positions by calcium are revealed.
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