The empirical concepts as electronegativity, ionicity and bulk
modulus are very important for studying the basic properties of
solids. The difficulty in defining the ionicity and bulk modulus
lies in transforming a qualitative or verbal concept into a
quantitative, mathematical formula. My works concentrated on using
empirical pseudopotential method (EPM) to calculate electronic
properties (ionicity factor) i in terms of the difference between
the first and second valence band at point X, Eg (V2-V1), and
making various formulas as a function of transverse effective
charge eT*, nearest-neighbor distance d, cohesive energy Ecoh, and
refractive index n0. I had investigated for the structural
properties (bulk modulus) B0 new models in terms of the cation part
SC of the charge density, the transition pressure Pt and the
lattice parameter. This study has three essential goals: 1. Define
the ionicity factor and the bulk modulus by the electronic band
structure and charge density, respectively. 2. Establish a new
scale. 3. Study the validity of the new models under external
effects. The reasonable results compared with experimental and
theoretical ones are obtained.
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