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The amount of ionic character - measure for oxide basicity

P. BALTĂ1,*

Affiliation

  1. University Politehnica Bucharest, faculty Applied Chemistry and Materials Science, chair Science and Engineering of Oxide Materials and Nanomaterials, Bucharest, Romania

Abstract

As it is known, the optical basicity scale Λ, elaborated by Duffy and Ingram is in use from 1971 and was adopted with interest in our laboratory too. Very soon, were observed some disadvantages which, during a current use of the Λ scale in the domain of oxides, create a certain discomfort. May be mentioned: the artificially established and then corrected limit of basicity; the complicated theoretical calculation of basicity even using different ways, sometimes resulting different values; the lack of a memorable and suggestive measurement unit. For such reasons in our laboratory was elaborated in 1983 and studied a different basicity scale using as measuring magnitude the amount of the ionic character of the chemical bond proposed by Pauling and easily obtainable with his formula by means of the electronegativity. The natural basicity limit of this scale named pB (acronym of ponderea bazicităţii in Romanian) is O2- and the pB values are expressed in percent The main ideas were included in 1984 in a text book and in 1985 was published the first paper in English. This communication, having a review character, contains many new and even original ideas too. The nature of the basicity of oxide and oxidic materials are discussed. The deduction of the formula for theoretical calculation is presented. The experimental method is described and, in addition, their use for evidencing the energetic effect of basicity and the structural nano-aggregates existing in nano-heterogeneous oxide glasses. Some results in interpreting the glass properties are shown as graphs, among them the correlation between basicity and the glass forming tendency; the magic basicity and the oxidic compound formation, the chemical reactivity and basicity, the interpretation of water pB and the glass resistance in water, the refractory resistance in molten glass. The accumulated results showed that pB basicity scale is friendly in applications, rich in scientific information and offer directly structural and practical orientation and data..

Keywords

Alternative basicity scale pB, Experimental and by calculus pB determination methods, Energetic effect, Chemical reactivity, Nano-heterogeneous glass structure.

Submitted at: June 17, 2011
Accepted at: Nov. 23, 2011

Citation

P. BALTĂ, The amount of ionic character - measure for oxide basicity, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 11-12, pp. 1377-1384 (2011)