Results of the de electrical conductivity (sigma) measurements (from 90 to
420 Kj on 15 com positions of the Cu-x(As(0.4)Se(0.3)Teo(0.3))(100-x) glass
es (x from 0 to 30) are presented. Similar to that observed [1] in the comp
osition dependencies of the mean atomic volume (V) and the glass transition
temperature (T-g) of these glasses, it is possible to delineate three regi
ons in the composition dependence of the sigma of these glasses. (i) For ad
dition of Cu up to 1 at %, the sigma register a decrease compared to that o
f the parent Aso(0.4)Seo(0.3)Teo(0.3) glass. (ii) For Cu > 1 at %, the cond
uction activation energy (Delta E) and the pre-exponential factor (C) decre
ase, with a concomitant increase in a (at 250 K) by about six orders of mag
nitude. (iii) Both Delta E and C show saturation for Cu > 23 at %. The a-co
mposition data are examined using the model developed earlier [1] to unders
tand, the V land T-g)-composition dependencies of these glasses. (C) 1999 K
luwer Academic Publishers.