An investigation was made of the temperature- and frequency-dependent ionic

conductivity in (Li0.67−xNa0.33Rbx)2B4O7 glasses with x = 0, 0.07, 0.2, 0.33, 0.47 or

0.6. The mixed-alkali effect of the ternary mixed alkali system

(Li0.67−xNa0.33Rbx)2B4O7 was compared with that of the binary mixed alkali systems

(Li1−xNax)2B4O7, (Li1−xRbx)2B4O7 and the single alkali glass Rb2B4O7. From the dc

conductivity and dc activation energy results, it was found that the

(Li0.67−xNa0.33Rbx)2B4O7 system exhibited the combined characteristics of the binary

mixed alkali systems, (Li1−xNax)2B4O7 and (Li1−xRbx)2B4O7. It was found that the

power-law exponent, n, for a binary alkali glass was the same as that for a ternary

alkali glass but was lower than that for a single alkali glass. This indicated that the

dimensionality of the conducting pathway in the mixed-alkali glasses of

(Li1−xNax)2B4O7, (Li1−xRbx)2B4O7 and (Li0.67−xNa0.33Rbx)2B4O7 was lower than that

in the single alkali Rb2B4O7.

Ionic Conductivity in Borate Glasses with Three Types of Mixed Alkali Cations.

M.Kim, H.W.Choi, C.H.Song, G.Y.Jin, Y.H.Rim, Y.S.Yang: Solid State Ionics,

2009, 180[6-8], 527-30