H. Jain et al., SIGNIFICANCE OF INTERMEDIATE RANGE STRUCTURE FOR ELECTRICAL-CONDUCTION IN ALKALI GERMANATE GLASSES, Journal of non-crystalline solids, 222, 1997, pp. 361-368
The dc ionic conductivity of the xM(2)O:(1-x)GeO2 glass series has bee
n measured as a function of temperature and composition where M is K o
r Rb and 0.0023 less than or equal to x less than or equal to 0.60. Th
e structure of the same glasses have been determined by measuring X-ra
y absorption fine structures, densities and X-ray photoelectron, Raman
and infrared absorption spectroscopies. With increasing alkali concen
tration the activation energy of conductivity decreases followed by an
increase and then a more rapid decrease at x approximate to 0.1. By c
orrelating this complex composition dependence of electrical conductiv
ity with the structural information we demonstrate that the intermedia
te range structure of glass affects ion transport in alkali germanate
glasses. (C) 1997 Elsevier Science B.V.