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The standard enthalpy of formation (ΔHo) has been considered to be an  interesting and useful parameter for the correlation of various properties of  alkali halides. The interrelation between ΔHo and structural parameters for  the halides of Li, Na, K and Rb has been thoroughly analyzed. When cationic  component element is kept constant in a homologous series of alkali halides,  the negative value of ΔHo has been observed to decrease linearly with  increase of interionic distance (d) and accordingly following empirical  equation ΔHo = α + βd (where α and β are empirical constants) has been  established. However, for common anionic series of alkali halides an opposite  nonlinear trend has been observed with the exception of common fluorides. The  correlation study on the standard enthalpy of formation has been extended in  term of radius ratio and also discussed in the light of ionization energy of  the metal, electron affinity of the halogen, size of the ions, ionic  character of bond and lattice energy of the compound

Correlation between standard enthalpy of formation, structural parameters and ionicity for alkali halides