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Correlation between Standard Enthalpy of Formation and Refractive Index in Alkali Halides

A. Nasar

The values of standard enthalpy of formation and refractive index of different alkali halides have been analysed and discussed in the light of ionic character of alkali metal-halogen bond. The correlation between these two parameters has been studied. An empirical second order polynomial equation of the following form ∆Hº exp = a + b η + c η2 has been proposed which, may be used to calculate standard enthalpy of formation of any alkali halide from the value of refractive index only.