Abstract
Electronic and ionic conductivities of silver selenide crystal (Ag
2 +
δ
Se) have been measured over a range of stoichiometry through the α-β transition by using solid state electrochemical techniques. In the high temperature β-phase Ag
2
Se shows metallic behaviour of electronic conductivity for high values of
δ
; with decrease in δ, the conductivity of the material exhibits a transition. The magnitude of change in electronic conductivity at the α -β transition is also determined by stoichiometry. Ionic conductivity of the β-phase does not vary significantly with stoichiometry. A model to explain the observed transport properties has been suggested.
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