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Temperature Dependence of Linear Thermal Expansion of CuGaSe2 Crystals

CuGaSe2 single crystals were grown by a traveling heater method, which is one of the solution growth techniques. The temperature dependence of the X-ray diffraction of CuGaSe2 was determined between 10 and 300 K. The room temeprature XRD pattern of CuGaSe2 corresponds to the ICDD data. No secondary phases are observed in the spectrum. The lattice constant of the a-axis increases and that of the c-axis decreases with increasing temperature. The linear thermal expansion of the c-axis calculated from the lattice constants indicates a negative value from 10 to 100 K.