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

Author(s): 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.

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