Structural and thermal properties of Cu1.75−xMxTe crystals.

Single crystals of Cu 1. 7 5 Te, Cu 1. 7 0 Zn 0. 0 5 Te and Cu 1. 7 0 Cd 0. 0 5 Te compounds were synthesized by Brijmen method and their crystal structure was studied by X-ray diffraction. The hexagonal, orthorhombic aand cubic structure phases of these compounds have been determined at room-temperature. Phase transitions at high-temperatures were observed. Lattice parameters for hexagonal, orthorhombic and cubic phases have been determined in the temperature range of T = 2 9 0 –1073 K. From the temperature dependences of the lattice parameters, the coefficients of thermal expansion of the existing modifications in the main crystallographic directions were calculated. [ABSTRACT FROM AUTHOR]