Elasticity of the Sm_(1-x)Y_xS alloy Based on Ultrasonic Measurements

摘要

The elastic moduli, sound velocities, Gruneisen parameter, Poisson's ratios and brittleness-plasticity criterion ratios are studied for the Sm_(1-x)Y_xS alloys. Their dependence on the concentration of alloy components including a valence transition from semiconductors into the metal phase is presented. Auxeticity (negative Poisson's ratio) is found for some concentrations.