Ionic conductivity of glasses with two and three types of alkali ions.

Gao Y, Cramer C

Research article (journal)

Abstract

We report, for the first time, frequency-dependent cond. spectra of glassy 0.1Li2O·0.1Na2O·0.1K2O·0.7B2O3 over a wide temp. range. The cond. isotherms of the studied glasses show a transition from their dc plateaus into a dispersive regime where the cond. continuously increases with frequency tending towards a linear frequency dependence at sufficiently low temps. At a given temp., the dc cond. values of glassy 0.1Li2O·0.1Na2O·0.1K2O·0.7B2O3 are much lower than those of 0.3[xM2O·(1-x)Me2O]·0.7B2O3 (M-Me=Li-Na, Li-K, and Na-K) and 0.2[xLi2O·(1-x)Na2O]·0.8B2O3 glass systems, and the dc cond. activation energy of glassy 0.1Li2O·0.1Na2O·0.1K2O·0.7B2O3 is higher than those of 0.3[xM2O·(1-x)Me2O]·0.7B2O3 and 0.2[xLi2O·(1-x)Na2O]·0.8B2O3 glasses with x=0, 0.2, 0.4, 0.6, 0.8, and 1, resp. The exptl. results are interpreted in terms of the Dynamic Structure Model (DSM) developed by Bunde, Ingram, and Maass. On the basis of our results, we predict that mixed alkali glasses with three types of cations will show a stronger mixed alkali effect in phys. quantities related to the ion transport than glasses with only two types of cations. [on SciFinder(R)]

Details zur Publikation

Publisher:
Pages: 7
Release year: 2005
Publishing company: Elsevier B.V.DO - 10.1016/j.ssi.2004.11.010