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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 08  1949
A NOTE ON THE CONSTITUTION OF GLASS : THE DEGREE OF ALTERATION OF THE CONSTITUENT OXIDES
H. J. ARNIKAR, M.Sc.
Pages : 31-38
DOI : 10.1080/0371750X.1949.10877863
Abstract
After presenting a brief review of our pret> ent knowledge regarding the constitution of glass as part I of the paper, the possibility of correlating the observed deviations from strict additivity in the physical properties with its constitution is considered in Part II. Most of the physical properties of glass such as, density, specific heat, coefficient of thermal expansion, thermal conductivity, refractivity, modulus of elasticity, etc., can be calculated if the percentage composition of the glass is known, and conver~ely one can prescribe a batch fmmula which would yield a glass of a required property, within certain limits. Such calculations, which have become routine operations in modern glass technology, are basEd on the factors emperically fixed for the different constituent oxides for each property that is additive. Winklemann and Schott, Turner and English, Russ and others have worked out these fuctor:;; for a number of such properties. If gla~s were ju1>t a solution of nonreacting oxide components, thesn factors may be expected to be identical with the values of the property of the respectiv,· constituent oxides. A scrutiny, however, reveals that this is not generally true, as the factor, F, attibutablc to a given constituent oxide is either a magnified or a diminished figure in relation to the actual value, f, of the property of that constituent, except only in certain cases. It is suggested in thit> paper that the quantity (f-F)jf-designated the relative disparity for a constituent, may be taken as a rough measure of the degree of alteration, a of that constituent, defined as the fraction of the total oxide that has undergone alteration, [(1-,) would represent the proportion remaining unaltered]. Certain results of the new application of this method, as well as- the lirnitatio~s in its wider application are considered ip the ~v.d.
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