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Synthesis, structure and optical properties of new tellurium oxide-based glasses within the TeO₂-TiO₂-WO₃ and TeO₂-NbO₂̩ ̩₅-WO₃ systems

Abstract : In this work, we present a contribution to the understanding of the short- to medium-range structure of TeO₂-based glasses via new glasses within the TeO₂-TiO₂-WO₃ (TTxWy) and TeO₂-NbO₂ ̩₅-WO₃ (TNxWy) systems. Consistent correlations are revealed between their structural (using Raman spectroscopy) and optical properties. Globally, no striking structural evolutions take place upon adding TiO₂, WO₃ or NbO₂ ̩₅. Adding TiO2 results in a phase-separation between amorphous TiO₂-rich regions and TeO2-rich network, in harmony with the predicted structural behavior on the basis of Dietzel’s cationic field strength theory. Adding WO₃ leads to (i) uniformly dispersed WO₆ octahedra throughout the Te–O–Te network (at low WO₃ contents) and (ii) amorphous WO₃-rich regions (at higher WO₃ contents). Adding NbO₂ ̩₅ engenders (i) a weak structural depolymerization of the Te–O–Te network and (ii) occurrence of NbO₂ ̩₅-rich regions. The investigated glasses exhibit high linear refractive indices (averages of 2.19 in TTxWy and 2.13 in TNxWy) and remarkable nonlinear susceptibilities χ(3) (averages of 7.03 *10-13 esu in TTxWy and 5.48 *10-13 esu in TNxWy, i.e., ~47 and ~37 times higher than χ(3) of SiO₂ glass).
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Submitted on : Thursday, May 17, 2018 - 3:35:22 PM
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Mohammed Reda Zaki. Synthesis, structure and optical properties of new tellurium oxide-based glasses within the TeO₂-TiO₂-WO₃ and TeO₂-NbO₂̩ ̩₅-WO₃ systems. Materials. Université de Limoges, 2018. English. ⟨NNT : 2018LIMO0017⟩. ⟨tel-01794499⟩

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