Defect Chemistry of Y Doped BaTiO3

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Abstract

Defect chemistry of Y doped BaTiO3 was investigated as a function of the Ba/Ti ratio. When the Ba/Ti ratio was greater than unity, Y3 + was substituted for the normal Ti site and the equilibrium conductivity showed a strong evidence of acceptor-doped behavior. With the Ba/Ti ratio < 1, Y3 + was substituted for the Ba site and the equilibrium conductivity showed donor-doped behavior. In the case excess Y2O3 was added to the stoichiometric BaTiO3(Ba/Ti = 1), the conductivity profile showed a donor-doped behavior at low concentrations (< 1.0 mol%), whereas, at higher donor levels (> 2.0 mol%), the equilibrium conductivity minimum shifted toward lower Po2, indicating acceptor doped behavior.

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