Glasses in the Sulfur-Selenium-Tellurium System and in the Arsenic (Germanium, Phosphorus)-Chalcogen-Chalcogen Systems

Abstract

In a number of binary and three-component systems, especially in systems containing sulfur as one of the components, not all the glass compositions can be equally easily obtained within the limits of the glass formation region. Thus, in the GeS binary system and in the threecomponent systems As-S-Se, Ge-S-Se, Ge-As-S, and others, the production of a number of compositions of glasses encounters serious methodological difficulties. Therefore in the study of the laws that govern the variation of the properties of glasses within the limits of the entire glass formation region, it is useful to employ empirical and semiempirical methods of calculating the properties of glasses from their composition. Calculations of the properties of glasses of many-component systems can be particularly useful. In the present section we consider the method of optimal polynomials, proposed in [283] for the calculation of the properties of complex glasses. This method makes it possible to determine, from unified points of view, for different characteristic quantities, the additive contributions of the components, as well as the contributions that come from their binary, ternary, and i-fold interactions.