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The present study provides information concerning the devitrification behavior of the xGd₂O₃·(100-x)[7TeO₂·3V₂O₅] vitreous system with 0≤x≤60mol% in which the Te₂V₂O₉ and GdVO₄ crystalline phases occur.

The presence of multiple cations (gadolinium, tellurium) in the glasses to attract the [VO₄] structural units for charge compensation yield a competition between these cations showing the drastic reduction of the characteristic features corresponding to the [VO₄] units (bandwidth, position and intensity). After the heat treatment applied at 400⁰C for 48h, two crystalline phases appear, namely the Te₂V₂O₉ and GdVO₄. The Te₂V₂O₉ crystalline phase is characteristic of the host glass ceramic. The strong affinity of the Gd⁺³ ions towards the vanadium units containing non-bridging oxygen is responsible for the disappearance of the Te₂V₂O₉ crystalline phase. The addition of higher Gd₂O₃ contents produce the gradual depolymerization of the vanadate chains and the formation of the GdVO₄ crystalline phase.

We propose a possible structural model of building blocks for the formation of the continuous random 7TeO₂·3V₂O₅ network glass based on DFT calculations.

Keywords: Gadolinium-tellurate-vanadate glass ceramics, FTIR spectroscopy, DFT calculations.