Linear optical susceptibility and clamped linear electro-optical tenser coefficients of orthorhombic KNbO3 are calculated using a formalism based on bond charge theory. Calculated values are in close agreement with experimental data. The covalent Nb-O bonds constituting distorted NbO6 octahedral groups are found to be the major contributors making these groups more sensitive than KO12 groups to electro-optic coefficients. (C) 2002 Elsevier Science Ltd. All rights reserved. References: 26
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