Crystals of cuprous halides, silver halides, and thallous halides are found t o show significantly different behaviour from that of alkali halides. This difference is mainly due to the presence of outermost d-electrons present in Cu+, Agf, and T1+ ions. I n t,he present paper an analytical potential form is used for the overlap repulsive energy derived by Harrison from quantum mechanical considerations. The parameters in this potential form have direct correlation with the valence state energies for outermost d-electrons. The potential model is applied to calculate the cohesive energies, pressure derivatives of bulk modulus, Griineisen parameter and its volume dependence using different existing theories.
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