The validity of an additivity rule is demonstrated for the repulsive hardness parameters in three crystal families viz. alkali hydrides, silver halides, and alkaline earth fluorides. The additivity rule provides a direct method of determining the repulsive hardness parameters for individual ions and thereby reduces the number of parameters considerably. Using the repulsive hardness parameters for individual ions derived from the overlap integrals an investigation is made on the crystal binding of LiH, NaH, KH, RbH, CsH, AgCl, AgBr, CaF 2 , SrF 2 , and BaF 2 . The interionic force model used here takes into account the long‐range electrostatic interactions, three‐body forces, shortrange repulsive, and van der Waals interactions. The cohesive energy and the pressure derivative of bulk modulus are calculated. The results are found to compare well with experimental data.
No takes yet. Share an insight, caveat, or question.
Shanker et al. (1980) studied this question.