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Ferroelectrics; crystal structure; electro-optical; bond charge

Linear optical susceptibility and clamped linear electro-optical tensor coefficients of tetragonal BaTiO₃ are calculated using a formalism based on bond charge theory. Calculated values are in close agreement with experimental data. The covalent Ti-O bonds constituting distorted TiO₆ octahedral groups are found to be major contributors to the electro-optic coefficients making them more sensitive than the BaO₁₂ groups for these properties. Orientations of chemical bonds play an important role in determining these properties.

P U Sastry¹

1. Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai - 400 085, India

Published

September 2002

Manuscript received

2 November 2001

Manuscript revised

15 April 2002