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  • 1 Faculdade de Engenharia, UNESP—Univ Estadual Paulista, Ilha Solteira, SP, Brazil
  • | 2 UFT—Universidade Federal do Tocantins, Palmas, TO, Brazil
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Abstract

Nucleation process and crystal growth for three samples of the (20-x)Li2O–80TeO2xWO3 glass system were studied using X-ray diffraction and differential scanning calorimetry techniques. X-ray diffraction data confirmed the amorphous characteristic of the as-quenched samples and indicated the growth of crystalline phases formed due to the thermal treatment for annealed samples. These results reveal the presence of three distinct γ-TeO2, α-TeO2 and α-Li2Te2O5 crystalline phases in the TL sample, and two distinct α-TeO2 and γ-TeO2 crystalline phases in the TLW5 and TLW10 samples. The activation energy and the Avrami exponent were determined from DSC measurements. The activation energy values X-ray diffraction data of the TLW10 glass sample suggest that γ-TeO2 phase occur before the α-TeO2. The results obtained for the Avrami exponent point to that the nucleation process is volumetric and that the crystal growth is two or three-dimensional.

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