摘要
Refractive indices and extinction coefficients of O.92Pb（Mgl/3Nb2/3）O3-O.O8PbTiO^（PMN-O.OSPT） single crystaJ are investigated by variable angle spectroscopic ellipsometry （VASE） at different wavelengths. The parameters relative to the energy band structure are obtained by fitting to the single-oscillator dispersion equation, and the band gap energy is also deduced from the Tauc equation. Similar to most oxygen-octahedra ferroelectries, PMN-O.OSPT has the same dispersion behavior described by the refractive-index dispersion parameters.
Refractive indices and extinction coefficients of O.92Pb（Mgl/3Nb2/3）O3-O.O8PbTiO^（PMN-O.OSPT） single crystaJ are investigated by variable angle spectroscopic ellipsometry （VASE） at different wavelengths. The parameters relative to the energy band structure are obtained by fitting to the single-oscillator dispersion equation, and the band gap energy is also deduced from the Tauc equation. Similar to most oxygen-octahedra ferroelectries, PMN-O.OSPT has the same dispersion behavior described by the refractive-index dispersion parameters.
基金
Supported by the National High-Tech Research and Development Program of China under Grant Nos 2008AA03Z410 and 2006AA03Z107, the National Natural Science Foundation of China under Grant Nos 60837003, 50777065 and 50602047, the Innovation Funds from Shanghai Institute of Ceramics of Chinese Academy of Sciences under Grant No SCX0608, and the Fund of National Engineering Research Center for Optoelectronic Crystalline Materials （2005DC105003） under Grant No 2007K05.
