Elastic Constants of Synthetic Sapphire at 27°C

Abstract

The six elastic stiffness constants of synthetic sapphire were independently determined by pulse‐echo and continuous‐wave (cw) resonance measurements at a frequency of 15 Mc. The values obtained from the pulse‐echo measurements are C₁₁=4.902, C₃₃=4.902, C₄₄=1.454, C₁₂=1.654, C₁₃=1.130, C₁₄=−0.232, in units of 10¹² dyn/cm². The results obtained from the cw resonance measurements are C₁₁=4.920, C₃₃=4.920, C₄₄=1.468, C₁₂=1.684, C₁₃=1.164, C₁₄=−0.234, in units of 10¹² dyn/cm². The results of the present investigation are compared with recent resonance measurements in the kc frequency range and with earlier work in the Mc range.