Abstract
Considering as a hypothesis a single type of defect, metallic vacancies, two models of the d-electron deficit have been proposed in nonstoechiometric β-NiSe and γ-CoSe compounds. Trial according to partial molar free enthalpy, measured with an electrochemical method, indicates that only the model in which the d-electron deficit is distributed on special metal atoms can be applied, provided the vacancy concentration is large enough to allow the other kinds of defects to be neglected, and provided the vacancies are not too numerous to interact with each other.
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