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New Study of Electrical Conductivity in Ni-Doped Non-Stoichiometric Lithium Tantalate

Ceramics of Li0.98-x Ta1.004-x/5 O3 solid solutions with 0 ≤ × ≤ 0.20 are studied by a new theoretical approach. From the experience, we have proposed the new vacancy models which are able to describe substitutional mechanism in Ni-doped lithium tantalate. Theoretical approach combined with generalised vacancy models allows us to establish a new expression of electrical conductivity which takes into account the defect structure of Ni-doped lithium tantalate. Calculation of the Curie temperature in Ni-doped non stoichiometric lithium tantalate reveals good correspondence with experimental results.