High-temperature X-ray diffraction study of Ag2S-Cu2S system

Single crystals of AgCuS, Ag1.55Cu0.45S, Ag1.55Cu0.45S and Ag1.55Cu0.45S compounds were synthesized using the Bridgman method. The crystal structures and phase transitions were studied by X-ray diffraction (XRD) method in the high temperature ranges. The monoclinic, orthorhombic, hexagonal and cubic phases were observed in the temperature range of 300K <= T <= 870K. Thermal expansion coefficients were calculated for different phases according to the lattice parameters. It was determined that the values of thermal expansion coefficients differ in different planes depending on the space group and symmetry.