Classification of Simple Oxides: A Polarizability Approach

Abstract A simple oxide classification has been proposed on the basis of correlation between electronic polarizabilities of the ions and their binding energies determined by XPS. Three groups of oxides have been considered taking into account the values obtained on refractive-index- or energy-gap-based oxide ion polarizability, cation polarizability, optical basicity, O 1 s binding energy, metal (or nonmetal) binding energy, and Yamashita–Kurosawa's interaction parameter of the oxides. The group of semicovalent predominantly acidic oxides includes BeO, B 2 O 3 , P 2 O 5 , SiO 2 , Al 2 O 3 , GeO 2 , and Ga 2 O 3 with low oxide ion polarizability, high O 1 s binding energy, low cation polarizability, high metal (or nonmetal) outermost binding energy, comparatively low optical basicity, and strong interionic interaction, leading to the formation of strong covalent bonds. Some main group oxides so-called ionic or basic such as CaO, In 2 O 3 , SnO 2 , and TeO 2 and most transition metal oxides show relatively high oxide ion polarizability, O 1 s binding energy in a very narrow medium range, high cation polarizability, and low metal (or nonmetal) binding energy. Their optical basicity varies in a narrow range and it is close to that of CaO. The group of very ionic or very basic oxides includes CdO, SrO, and BaO as well as PbO, Sb 2 O 3 , and Bi 2 O 3 , which possess very high oxide ion polarizability, low O 1 s binding energy, very high cation polarizability, and very low metal (or nonmetal) binding energy. Their optical basicity is higher than that of CaO and the interionic interaction is very weak, giving rise to the formation of very ionic chemical bonds.

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