OBTAINING THERMOELECTRIC MATERIAL Cu<sub>2</sub>Se BY THE SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS METHOD

Abstract

Using the method of self-propagating high-temperature synthesis in the combustion mode, a product based on the α-Cu2Se phase was obtained from a 2Cu + Se powder mixture. The effect of synthesis conditions on the composition of the combustion product was studied and the unit cell parameters of the synthesized phases were determined. It has been established that as a result of combustion of pressed 2Cu+Se mixtures at an Ar pressure of 0.5–1.5 MPa, a product is formed containing two modifications of Cu2Se – low-temperature monoclinic α-Cu2Se and high-temperature cubic β-Cu1.8Se phases. Combustion of a 2Cu+Se mixture of bulk density at an Ar pressure above 0.5 MPa yielded a single-phase product, the monoclinic α-Cu2Se phase.