Advanced search
Start date
Betweenand
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Microscopic and thermodynamic interpretations of experimental data on ionic conductivity in lithium silicate glasses

Author(s):
Ferreira Nascimento, Marcio Luis [1] ; Martins Rodrigues, Ana Candida [2] ; Souquet, Jean Louis [2, 3]
Total Authors: 3
Affiliation:
[1] Univ Fed Bahia, Inst Humanities Arts & Sci, Vitreous Mat Lab, BR-40170115 Salvador, BA - Brazil
[2] Univ Fed Sao Carlos, Dept Mat Engn, Lab Mat Vitreos, BR-13565905 Sao Carlos, SP - Brazil
[3] ENSEEG, Lab Electrochim & Physicochim Mat & Interfaces, F-38402 St Martin Dheres - France
Total Affiliations: 3
Document type: Journal article
Source: PHYSICS AND CHEMISTRY OF GLASSES-EUROPEAN JOURNAL OF GLASS SCIENCE AND TECHNOLOGY PART B; v. 51, n. 1, p. 69-77, FEB 2010.
Web of Science Citations: 6
Abstract

Experimental data from the literature on electrical conductivity are reviewed for 43 glass compositions in the xLi(2)O-(1-x)SiO(2) system (0.05<x<0.67). The data are presented herein as a function of temperature and in isothermal plots as a function of the Li(2)O molar ratio, x. Below the glass transition temperature, T(g), the experimental ionic conductivity of all the compositions follows an Arrhenius law, sigma=sigma(0)exp(-E(A)/RT). The large quantity of experimental data minimizes the experimental inaccuracy in glass composition and conductivity measurements, thus allowing for accurate estimates of the mean values of the pre-exponential term (sigma(0)) of the Arrhenius expression and the activation energy (E(A)), as well as a precise assessment of the variations in isothermal conductivity with the molar ratio, x. The value of the pre-exponential term and the variation of isothermal conductivity and activation energy with x are then interpreted by reference to general concepts for ionic transport in solids, and to the so-called weak electrolyte theory. The Anderson \& Stuart model is employed to estimate the absolute values of activation energy. The association of the intrinsic cationic pair model and the weak electrolyte theory provides a good description of the variations in electrical conductivity and activation energy as a function of the Li(2)O molar ratio. The Anderson \& Stuart model leads to consistent absolute values of activation energy only if an arbitrarily chosen value of jump distance is employed in the corresponding expression. (AU)

FAPESP's process: 07/08179-9 - Kinetic processes in glasses and glass ceramics
Grantee:Edgar Dutra Zanotto
Support type: Research Projects - Thematic Grants