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Electro-optic; bond charge; crystal structure; ferroelectrics.

Linear electro-optical tensor coefficients and optical susceptibility of tetragonal KNbO₃ are calculated using a formalism based on bond charge theory. Results are in close agreement with the experimental data. The covalent Nb–O bonding network comprising the distorted NbO₆ octahedral groups in the structure is found to be a major contributor to the electro-optic coefficients making these groups more sensitive to these properties than the KO₁₂ groups. The orientations of the 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

June 2007

Manuscript received

12 November 2006

Manuscript revised

6 March 2007

Accepted

16 March 2007