Linear Thermal Expansion Coefficient of the NaCl Phase of CsCl

Cesium chloride undergoes a phase change from the low-temperature CsCI structure to the high-temperature NaCI structure at about 469°C.l There is a volume increase of about 16% when the NaCI structure appears.1 The nature of the transition is of interest, as are the physical properties of the high-temperature phase. If sufficient high-temperature phase data are available for CsCI, calculations of the heat of transition can be made more accurately