Rezumat articol ediţie STUDIA UNIVERSITATIS BABEŞ-BOLYAI

În partea de jos este prezentat rezumatul articolului selectat. Pentru revenire la cuprinsul ediţiei din care face parte acest articol, se accesează linkul din titlu. Pentru vizualizarea tuturor articolelor din arhivă la care este autor/coautor unul din autorii de mai jos, se accesează linkul din numele autorului.

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.