Electrical conductivity mechanisms in barium and lead titanates

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Abstract
The results are discussed for studies of the electrical conductivity in barium and lead titanates, of the effect of electrical fields and injection phenomena on the electrical conductivity, of temperature treatment in various gaseous media, and of nonisovalent substitutions. A technique for separate determination of the conductivity value and type of conductivity for crystallites and intercrystallite layers of semiconductive barium titanate ceramic specimens is suggested. This permits the discussion of a mechanism for the observed positive temperature coefficient of resistance. An electrical conductivity mechanism for barium and lead titanates is suggested, in which an important role is assigned to the presence of oxygen vacancies.

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