A note on the composition dependence of elastic properties of Se-P glasses

Abstract

Longitudinal and shear wave ultrasonic velocities are reported in Se-P glasses over the composition range 0-50 at % P. The glass transition temperatures T_g show maxima at 30 and 50 at % of P, in consonance with earlier data. The bulk modulus shows minima at these compositions, contrary to the expectation of maxima. These are discussed in relation to the formation of compounds at specific compositions and the nature of the covalent bonding in the glasses.