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Highly Transparent Fluorotellurite Glass-Ceramics: Structural Investigations and Luminescence Properties

Abstract : Crystallization from glass can lead to the stabilization of metastable crystalline phases, which offers an interesting way to unveil novel compounds and control the optical properties of resulting glass-ceramics. Here, we report on a crystallization study of the ZrF4-TeO2 glass system and show that under specific synthesis conditions, a previously unreported Te0.47Zr0.53OxFy zirconium oxyfluorotellurite antiglass phase can be selectively crystallized at the nanometric scale within the 65TeO2-35ZrF4 amorphous matrix. This leads to highly transparent glass-ceramics in both the visible and near-infrared ranges. Under longer heat treatment, the stable cubic ZrTe3O8 phase crystallizes in addition to the previous unreported antiglass phase. The structure, microstructure, and optical properties of 65TeO2-35ZrF4Tm3+-doped glass-ceramics, were investigated in detail by means of X-ray diffraction, scanning and transmission electron microscopies, and 19F, 91Zr, and 125Te NMR, Raman, and photoluminescence spectroscopies. The crystal chemistry study of several single crystals samples by X-ray diffraction evidence that the novel phase, derived from α-UO3 type, corresponds in terms of long-range ordering inside this basic hexagonal/trigonal disordered phase (antiglass) to a complex series of modulated microphases rather than a stoichiometric compound with various superstructures analogous to those observed in the UO3–U3O8 subsystem. These results highlight the peculiar disorder–order phenomenon occurring in tellurite materials.
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Submitted on : Wednesday, January 6, 2021 - 5:08:21 PM
Last modification on : Thursday, January 7, 2021 - 3:40:45 AM

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Jean-Paul Laval, Jean-René Duclère, Vincent Couderc, Mathieu Allix, Cécile Genevois, et al.. Highly Transparent Fluorotellurite Glass-Ceramics: Structural Investigations and Luminescence Properties. Inorganic Chemistry, American Chemical Society, 2019, 58 (24), pp.16387-16401. ⟨10.1021/acs.inorgchem.9b01955⟩. ⟨hal-02443274⟩

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