Elastic constants of CsBr and CsI from 4.2°K to room temperature

Abstract

The elastic constants of pure single crystals of CsBr and CsI have been measured at liquid-helium, liquid-nitrogen, and room temperatures. For CsBr, the values of c11, c12, and c44 at 4.2°K are 3.437, 1.035, and 0.999 in units of 1010 N/m2. The corresponding values of CsI at 4.2°K are 2.737, 0.793, and 0.825·1010 N/m2. The elastic constants give the Debye temperature 148.8°K for CsBr and 125.6°K for CsI. The infrared resonance frequencies calculated from compressibility data are in agreement with those obtained from infrared spectroscopy. © 1964 The American Institute of Physics.