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Published in: Journal of Materials Science 23/2020

14-05-2020 | Ceramics

Spectroscopic study of some new cobalt-doped tellurite glass–ceramics

Authors: Liviu Bolunduţ, Petru Păşcuţă, Eugen Culea, Maria Boşca, Lidia Pop, Răzvan Ştefan

Published in: Journal of Materials Science | Issue 23/2020

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Abstract

New glass–ceramics of the xCo2O3(100 − x)[80TeO2–19Li2O–1ZrO2] system (where 0 ≤ x ≤ 20 mol%) were prepared by melt-quenching technique and investigated by X-ray diffraction, FTIR, UV–Vis and EPR spectroscopies. The nature of the samples and the structural changes that take place with increasing the cobalt oxide content were followed by X-ray diffraction. FTIR spectroscopy shows that the network structure of the studied samples consists of TeO3, TeO4, LiO4, CoO6 and ZrO4 structural units and the proportion between these units depends on the cobalt content of samples. UV–Vis measurements performed in the 300–1800 nm spectral range show absorption peaks characteristics of transitions belonging to both Co2+ and Co3+ ions. Based on the UV–Vis data, the optical band gap energy, refractive index, dielectric constant and tendency of metallization of the studied system were determined. The compositional evolution of these parameters was discussed with respect to the cobalt ions content of samples. The EPR spectra show the presence of Co2+ ions in both their high- and low-spin states, S = 3/2 and S = 1/2.

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Metadata
Title
Spectroscopic study of some new cobalt-doped tellurite glass–ceramics
Authors
Liviu Bolunduţ
Petru Păşcuţă
Eugen Culea
Maria Boşca
Lidia Pop
Răzvan Ştefan
Publication date
14-05-2020
Publisher
Springer US
Published in
Journal of Materials Science / Issue 23/2020
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-020-04749-6

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