Abstract
Electrical transport studies of five compounds (x = 0, 0,25, 0.33, 0.50 and 0.75) in the system (1 −x) Cul:xCdl2have been reported. It has been observed that all compounds of this system undergo phase transition from lower temperature low conductingβ-phase to higher temperature high conductivityα-phase. The phase transition temperature (Tp) decreases systematically withx being 642 forx = 0 and 500 K forx = 0.50. AboveTp all compounds are typical superionic solids with Cu+ ion as the entity of charge carrier. From the stability, temperature span of superionic phase,Tp andσ values point of view Cu3Cdl5 (x = 0.25) appears to be the best superionic solid of this system. The extended lattice gas model has been shown to suit better for explaining the electrical transport of solids with O⩽x ⩽ 0.5 of this system in superionic solid phase. BelowTp all compound of this sytem behave as normal ionic solid with relatively high conductivity. They yield usual “Knee temperature” and below this temperature conductivity becomes extrinsic. The activation enthalpy, heat of transport and enthalpy for the formation of defects have also been evaluated from experimental electrical conductivity and thermoelectric power data in each case.
Published Version
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