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- Title
Model considerations of changes in the average M-O coordination numbers of ternary alkali mixed glass former phosphate glasses, A<sub>2</sub>O-M<sub>y</sub>O<sub>z</sub>-P<sub>2</sub>O<sub>5</sub>.
- Authors
Hoppe, U.
- Abstract
Several mixed glass former MyOz-P2O5 glasses show changes of the oxygen coordination numbers of the M atoms in definite intervals of chemical composition. A third component, such as an alkali oxide, A2O, complicates the description of the behaviour. Recent diffraction results for sodium germanophosphate glasses suggest assuming the Ge-O coordination numbers to depend on the amount of the available O atoms that is reduced by a definite fraction of nonbridging O atoms. This latter fraction supplies the counter charge for the alkali ions. The model is corroborated by the tendencies of the changes of the oxygen coordination numbers that are reported for glass former atoms of ternary phosphate glasses of similar compositions. Some of the obvious differences that exist with the predictions of the simple model are due to the poor ability of glass formers to form a five-fold coordinated network unit.
- Subjects
PHOSPHATE glass; COORDINATION number (Chemistry); ALKALI metal ions; GERMANIUM; TERNARY system
- Publication
Physics & Chemistry of Glasses: European Journal of Glass Science & Technology Part B, 2016, Vol 57, Issue 6, p254
- ISSN
1753-3562
- Publication type
Article
- DOI
10.13036/17533562.57.6.041