Braunger, M. L. [UNESP]Escanhoela, C. A.Fier, I. [UNESP]Walmsley, L. [UNESP]Ziemath, E. C. [UNESP]2013-09-302014-05-202013-09-302014-05-202012-10-15Journal of Non-crystalline Solids. Amsterdam: Elsevier B.V., v. 358, n. 21, p. 2855-2861, 2012.0022-3093http://hdl.handle.net/11449/24973The effects of substituting Si by M4+ cations in soda-lime silica glasses were analyzed by impedance spectroscopy in the frequency range of 1 Hz-1 MHz. The glass composition was (mol%) 22Na(2)O center dot 8CaO center dot 65SiO(2)center dot 5MO(2), M = Si, Ti, Ge, Zr, Sn, and Ce. Although the Na+ concentration in the glasses is constant, the Zr-containing glass exhibits the highest dc conductivity and the lowest activation energy, while the Ce-containing glass exhibits the lowest conductivity. The activation energies obtained experimentally agree with those obtained by a theoretical equation proposed by Anderson and Stuart. The differences in electrical conductivity presented by the several M-containing glasses are attributed to the effect that the M4+ ion has on the mobility of the diffusing Na+ ion. (C) 2012 Elsevier B.V. All rights reserved.2855-2861engSilicate glassImpedance spectroscopyElectrical conductivityArtigo10.1016/j.jnoncrysol.2012.07.013WOS:000309845800003Acesso restrito7698772123076672