Heat Capacity, Thermal Expansion And Ultrasound Propagation Velocity In Antimony Germanium Slenide (Sbgexsey) Glasses With Constant Antimony Content

The variation of acoustical wave propagation velocity, moduli of elasticity, and adiabatic compressibility with Ge composition is is practically linear, except for the glass containing 25 at.% Ge, which lies in the concn. triangle on the pseudobinary section GeSe2-Sb2Se3. The increase of Ge content over the stoichiometric amount in the binary and ternary system leads to an increase in d. and moduli of elasticity and a decrease in compressibility. As Ge was added to the ternary systems, the glass transition temperature, tg, increased while the thermal expansion coefficient, alpha, and heat capacity Cp, decreased. However, at a Ge content >25 at.%, Cp increased and tg decreased possibly due to the formation of weaker Ge-Ge bonds.