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Short-range structure and thermal properties of alumino-tellurite glasses

Abstract: Alumino-tellurite glasses with wide range of Al2O3 concentration (1 to 20-mol%) are prepared and their short-range structural and thermal properties are studied by Raman spectroscopy, 27Al Magic Angle Spinning Nuclear Magnetic Resonance (MAS-NMR) and Differential Scanning Calorimetry (DSC). Glass sample with 1-mol% of Al2O3 has Te O co-ordination of 3.66, which is close to the value of 3.68 reported in pure TeO2 glass. Te O co-ordination decreases steadily to 3.33 on increasing alumina content to 20-mol%. 27Al MAS-NMR studies found that Al ions exist in hexa, penta and tetrahedral co-ordination in the alumino-tellurite network. On increasing alumina content from 3 to 20-mol%, the concentration of hexa-co-ordinated Al O units decreases from 54% to 35% with a simultaneous increase in the concentration of penta and tetra co-ordinated Al O units. Glass transition temperature increases with increase in Al2O3 concentration and correlates directly with the average single bond enthalpy of the glass network.

 Autoría: Kaur A., Khanna A., González-Barriuso M., González F., Chen B.,

 Fuente: Journal of Non-Crystalline Solids, 2017, 470, 14-18

Editorial: Elsevier

 Fecha de publicación: 15/08/2017

Nº de páginas: 5

Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.jnoncrysol.2017.04.034

ISSN: 0022-3093,1873-4812

Url de la publicación: https://doi.org/10.1016/j.jnoncrysol.2017.04.034

Autores/as

KAUR, AMANDEEP

KHANNA, ATUL

FERNANDO GONZALEZ MARTINEZ

CHEN, BANGHAO