Enthalpy relaxation of the glassy matrix in vanadium–molybdenum–tellurite oxide glasses

CARDILLO, E.; TERNY, S.; FRECHERO M. A.

THERMOCHIMICA ACTA

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2013 vol. 566 p. 10 - 14

0040-6031

tIn this paper, we analyze using differential scanning calorimetry (DSC) how a disordered structure,obtained by the quenching of oxides melted into glass, is related to the nature of the modi-fier cation. We estimated the enthalpy relaxation in based tellurite oxide glasses of formula xM2O(1−x)(0.5 V2O5·0.5MoO3) 2TeO2when they are modified with univalent metal oxides as Na+, Li+andAg+. As ionic conductors in tellurite oxide glasses, these cations have the same charge but different size,electronic configuration and, in addition, their electric behavior is quite different. We show that the jumpin the Cpat Tgis also related to the nature of the modifier cation. We study the conventional view of theconfigurational entropy of liquid that is frozen below the glass transition temperature (Tg) with what iscalled entropy loss. We explore whether or not there is a relationship between the nature of the modifieroxide and its magnitude.In this paper, we analyze using differential scanning calorimetry (DSC) how a disordered structure,obtained by the quenching of oxides melted into glass, is related to the nature of the modi-fier cation. We estimated the enthalpy relaxation in based tellurite oxide glasses of formula xM2O(1−x)(0.5 V2O5·0.5MoO3) 2TeO2when they are modified with univalent metal oxides as Na+, Li+andAg+. As ionic conductors in tellurite oxide glasses, these cations have the same charge but different size,electronic configuration and, in addition, their electric behavior is quite different. We show that the jumpin the Cpat Tgis also related to the nature of the modifier cation. We study the conventional view of theconfigurational entropy of liquid that is frozen below the glass transition temperature (Tg) with what iscalled entropy loss. We explore whether or not there is a relationship between the nature of the modifieroxide and its magnitude.