Abstract
The physical properties of Cu-doped S-based ternary glassy alloys have been examined experimentally and theoretically. The Cu2xGe30-xS70-x(0.0 <= x <= 5.0at.%) chalcogenide glasses have been prepared using the well-known melt quenching method. It was found that the coordination number increases from 2.6 to 2.7 with increasing the Cu content from 0 to 10 at %. As well, the glass density and compactness are increased, while the molar volume is decreased. The cohesive energy and the average heat of atomization show similar behavior with the enhancement of Cu in the Ge-S binary glasses. It was found that the optical band gap values decrease from 2.75 to 2.28 eV with increasing the Cu content. From the results of the investigated samples, the covalency parameter is greater than 84%, so that these glasses can be used as stable glass former. The elastic moduli (bulk (K), micro-hardness (H), Young (Y)) and Poisson's ratio (sigma) of the prepared glasses were estimated using the ultrasonic velocities (longitudinal (v(L)) and transverse (v(T))) and the density (rho).