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The electret state in a model group of oxides with the perovskite structure has been studied. The magnitude of the electret charge has been found to depend on the concentration of intrinsic point defects in the structure, i.e., of the Aand 0-ion vacancies. A correlation has been revealed between the magnitude and stability of the electret charge, on the one hand, and the mutual position of allowed energy bands of the elements contained in the oxides on the other.

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Analyzed are the general conditions of thermodynamic equilibrium in polymolecular adsorption films of polar liquids. Thermal equations of adsorption and a capillary condensation are derived for systems with a developed interphase boundary.

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