Testing a Point-Dipole Electro-Optic Model by an Application to Lead Titanate
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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A molecular point-dipole model that has been used successfully to calculate ferroelectric and electro-optic properties of the perovskite barium titanate BaTiO3 is further tested here by an application to lead titanate PbTiO3. The model calculates lorentz factors by the method of Rama Rau and the crystals internal electric fields by the Ewald method of lattice sums. The model further treats the polarizabilities of ions as field-dependent and simulates covalency in bonds by replacing the full ionic charge by an effective charge. The Kerr and Pockel electro-optic constants are determined by the anisotropy induced in the refractive index by an external electric field.
- Solid State Physics