info:eu-repo/semantics/article
IR absorption spectra of lithium and silver vanadium-tellurite based glasses
Fecha
2007-10Registro en:
Frechero, Marisa Alejandra; Quinzani, Oscar Valentín; Pettigrosso, Rosa Susana; Villar, Marcelo Armando; Montani, Ruben Alfredo; IR absorption spectra of lithium and silver vanadium-tellurite based glasses; Elsevier Science; Journal of Non-crystalline Solids; 353; 30-31; 10-2007; 2919-2925
0022-3093
CONICET Digital
CONICET
Autor
Frechero, Marisa Alejandra
Quinzani, Oscar Valentín
Pettigrosso, Rosa Susana
Villar, Marcelo Armando
Montani, Ruben Alfredo
Resumen
The aim of the present paper is to give structural information in order to set a correlation between the electrical conductivity behavior and structures of lithium and silver vanadium-tellurite based glasses. We report our structural studies and compare the effect of the nature of the metallic cation on glasses of the form XM2O · (1 - X)V2O5 · 2TeO2 (where 0 ≤ X < 1 and M = Li or Ag). Fourier transform infra-red (FTIR) spectra were recorded for all compositions and complementary differential scanning calorimetry (DSC) measurements and X-ray diffraction (XRD) measurements were also carried out. This paper should be considered as complementary to a previous article reporting the conductive behavior of theses glasses. In the latter we reported the obtained results on electrical conductivity studies. The results confirm the existence of a transition from a typically electronic (polaronic) conductive regimen when the molar fraction (X) of M2O is equal to 0, to an ionic conductive regimen when X tends to 1. The evidence for the independent migration path for both electrons and ions was put into evidence by studying the electrical conductivity behavior in a complementary system of the form X M2O · (1 - X)[0.5V2O5-0.5MoO3] · 2TeO2. In this system vanadium was partially replaced by molybdenum which acts as a 'diluting' agent of the active centers involved in the electronic transport.