About cookies on this site Our websites require some cookies to function properly (required). In addition, other cookies may be used with your consent to analyze site usage, improve the user experience and for advertising. For more information, please review your options. By visiting our website, you agree to our processing of information as described in IBM’sprivacy statement. To provide a smooth navigation, your cookie preferences will be shared across the IBM web domains listed here.
Publication
Solid State Ionics
Paper
Correlation between atom distribution and the mixed alkali effect in (Na, K)-β-gallate
Abstract
Na-β-gallate is an alkali fast ion conductor which is isostructural with β-Al2O3. Previous work had shown that the conductivity of crystals having mixed (Na, K) compositions is greatly reduced over that of the pure sodium and potassium compounds. The anomaly is similar to the "mixed alkali effect" observed in glasses and amorphous materials. Crystallographic investigation of the pure compounds and a crystal in the vicinity of the conductivity minimum has revealed that the drop in conductivity is accompanied by site preferences of Na+ and K+. The conduction plane is characterized by three distinct sites for the alkali ions, a normal Beevers-Ross lattice site and two interstitial sites. K+ is present on the normal lattice sites only. Na+ is exclusively present on the interstitial sites. © 1981.