Abstract
The relation existing between the average electron density and electronegativity of the elements allows one to examine the influence of pressure on the ionic-covalent bond of a compound. The increase with pressure of the effective electronegativity of an atom in a compound corresponds to a decrease in the ionic character of the ionic-covalent bond, in agreement with what has been deduced from the study of the electronic transitions of solids under pressure. Therefore, the increase in covalent bond character is correlated to the increase in pressure in the earth field. With increasing pressure, solid phases with low compressibility and high packing index are stable. A change from coordination 4–6 for silicon is associated to the change silicates-oxides. In the upper mantle geochemical differentiation of K, Na, Ca, Mg, Fe can be explained in terms of diffusivity of such elements under pressure.
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