Coefficients of Thermal Expansion in LaGaSiO and CaTaGaSiO Crystals.

The ordered CaTaGaSiO and disordered LaGaSiO crystals of the lantangallium silicate family were grown via the Czochralski method. The independent coefficients of thermal expansion of crystals αc and αa were determined using X-ray powder diffraction based on the analysis of X-ray diffraction spectra measured in the temperature range of 25~1000 °C. It is shown that, in the temperature range of 25~800 °C, the thermal expansion coefficients are linear.