Pressure Dependence of Elastic Constants of Cesium Halides

The single crystal elastic constants of CsCl, CsBr, and CsI have been measured at 13 °C as a function of hydrostatic pressure. The maximum pressure ranged from 2.3 to 6 kbar but was extended up to 10 kbar for two runs. The pressure dependence of the elastic constants was found to be linear within experimental error. The experimental results are compared with theoretical data by Nran'yan and Ghate. Also, the stability of the cesium chloride structure under pressure is discussed.