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Abstract-The electric conductivity of perovskite like Ba 2 (In 1 -x Al x ) 2 O 5 solid solutions (0 < x ≤ 0.20) characterized by structural disordering in the oxygen sublattice was studied as a function of temperature and partial pressure of oxygen in an atmosphere with a low content of water vapors = 3 × 10 -5 atm). When In 3+ was partially replaced by Al 3+ , the oxygen ion conductivity increased because of the disordering of oxygen structural vacancies, leading to a significant increase in the total electric conductivity of the samples.

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