Defects in titanates
by Arvids Stashans
International Journal of Nanotechnology (IJNT), Vol. 1, No. 4, 2004

Abstract: Electronic, structural and optical properties of titanates (BaTiO₃, SrTiO₃, CaTiO₃ and PbTiO₃) containing different point defects are reviewed and discussed in the present work. The results are obtained using a quantum-chemical method based on the Hartree-Fock formalism and utilising the Large Unit Cell (LUC) and the Embedded Molecular Cluster (EMC) models. The outcomes of the computations are compared and discussed in the light of the available experimental data. The formation of Jahn-Teller (JT) polarons and bipolarons due to the presence of some point defects in the titanate crystals are found to be very important in order to understand better the behaviour of these materials. In particular, such phenomena as the non-linear photoconductivity in BaTiO₃, the drastic increase in the electrical conductivity in CaTiO₃ and BaTiO₃ crystals, and the superconductivity in SrTiO₃ could be completely or partially explained by the presence of JT polarons and different interacting mechanisms between these defects.

Online publication date: Wed, 12-Jan-2005

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