Theoretical study of temperature dependence of spontaneous polarization, optical properties and free and clamped linear electrooptic coefficients of BaTiO3in the tetragonal phase

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Abstract
The microscopic mechanism of refractive indices, birefringence, spontaneous polarization and free and clamped electrooptic effects of BaTiO3 is discussed by using a microscopic model taking account of a quantum method based upon the orbital approximation and the dipole-dipole interaction due to the local field acting on the constituent ions. It is found that the electronic polarizabilities play a major role in these calculations and that the birefringence δn and the free and clamped linear electrooptic coefficients are in good agreement with the experimental data.