Basicity or Ionicity – A New Approach for Understanding Glass Properties

Adrian Volceanov

doi:10.4028/www.scientific.net/AMR.39-40.129

Paper Titles

The Structure-Property Relationship in Oxide Glasses: A Thermodynamic Approach
p.103

Transport and Relaxation Study of Ionic Phosphate Glasses
p.111

Glass as Solid Non-Equilibrium Phase under Negative Pressure
p.117

New Paradigm of Glass Structure and Physicochemical Essence of Glass Transition
p.123

Basicity or Ionicity – A New Approach for Understanding Glass Properties
p.129

Poisson's Ratio and the Glass Network Topology - Relevance to High Pressure Densification and Indentation Behavior
p.137

Glass Property Databases: Their History, Present State, and Prospects for Further Development
p.147

Properties of Silica Glass Doped with Titanium Oxide
p.153

Raman Spectroscopic and DTA Studies of TeO₂-ZnO-Na₂O Tellurite Glasses
p.159

HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 39-40Basicity or Ionicity – A New Approach for...

Basicity or Ionicity – A New Approach for Understanding Glass Properties

Abstract:

Basicity of glass is still a challenge in spite of various attempts to measure or calculate it. The values assigned for basicity of glasses, either calculated or experimentally determined, are not always in full agreement with actual facts, and discrepancies among the theoretical ones are not unusual. For instance, SiO2 is described by a single basicity value even if the polymorphs of SiO2 are quite different. Only few attempts were made to face this challenge. Present paper deals with a novel approach on theoretical ionicity / basicity based on electronic energy levels or band structure of solids. Another major adjustment takes into account the possibility of decomposing ionicity of complex chemical bondings into a sum of binary bondings. Considering the distribution of the interbonding angles specific for vitreous systems, it is possible to estimate both a local ionicity (basicity) of bondings and a global (mean) basicity of glass. The variation of basicity (ionicity) with temperature is also presented, this finding being able to open a new view on thermal history of glass considered through chemical character of bondings.