Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10631376 | Journal of Non-Crystalline Solids | 2005 | 13 Pages |
Abstract
Equilibrium concentrations of oxygen rich and deficient defect centers are calculated as a function of temperature and glass redox condition for germanosilicate glasses. We have here used the approach of Silin and Lace [J. Non-Cryst. Solids 149 (1992) 54-61] but extended it to include the case of binary system of germanosilicate glasses. A set of 23 reactions is identified as the possible pathway for formation of different defect centers. Each of these reactions are represented by forward and backward steps with Arrhenius kinetics and their activation energies are estimated based on the relevant bond energies of the involved species. Equilibrium concentrations are determined by setting rates of each of these reactions equal to zero. Typical results are presented for glasses which are: (i) stoichiometric, (ii) glasses with excess oxygen levels of 1016 to 1020Â cmâ3, and (iii) glasses which are oxygen deficient by 1016 to 1018Â cmâ3.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Pushkar Tandon, Jitendra Balakrishnan,