Structural Properties and Crystallization of Sodium Tellurite Glasses

Abstract

The structural properties and crystallization behaviour of xNa 2O-(100-X)TeO2 (0 ≤ x ≤ 33.3, x-% mole fraction) glasses have been investigated by Raman spectroscopy, X-ray diffraction (XRD) and differential scanning calorimetry (DSC). the Raman spectra of glasses show systematic changes in structural units, from TeO4 trigonal bypiramids (tbps) to TeO3 trigonal pyramids (tps) with increasing Na 2O content in glass. These structural changes are result of Te- eqOax-Te disruption and the formation of non-bridging oxygens (NBOs) in glass network. When heated at 623 K for 10 h glasses crystallized to different phases: α-TeO2, Na2Te 4O9 and a new crystalline phase which is believed to be a polymorph of Na2Te2O5.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Crystal phases; DSC; Raman spectroscopy; Structure; Tellurite glasses

International Standard Serial Number (ISSN)

1334-417X; 0011-1643

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2024 The Authors, All rights reserved.

Creative Commons Licensing

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.

Publication Date

01 Dec 2008

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