Abstract
Our preceding experimental results on electrical conductivity in nickel oxide at high temperature [1] have been interpreted assuming the simultaneous presence of singly and doubly ionized nickel vacancies. A thermodynamic model is proposed on this basis, which allows to determine, as functions of Po 2, and T, the laws of variations of n and of Δ H σ, which are correlated with conductivity in the general expression: d lnσ = 1 n d In Po 2− ΔH σ R d( 1 T ) . The ratios [V′ Ni] {[V″ Ni] + [V′ Ni]} hae been determined for the whole range of existence of N values and experimental results of electrical conductivity are in good agreement.
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