Inherent optical behavior and structural variation in Na0.5Bi0.5TiO3-6% BaTiO3 revealed by temperature dependent Raman scattering and ultraviolet-visible transmittance
2014
Optical properties of Na 0.5Bi0.5TiO3-6%BaTiO3 (NBT-6%BT) single crystal have been studied by temperature dependent Raman and ultraviolet-visible spectra from 25 to 180 °C. With increasing the temperature, the absorption edge approximately decreases from 3.13 to 3.04 eV. Moreover, abnormal changes of phonon mode and spectral transmission are observed at 83, 106, and 150 °C, which can be unambiguously correlated with thermal evolutions of polar nano-regions and phase transition. It indicates that there is an inherent relationship between optical behavior and structural variation of NBT-6%BT, which provides a valid methodology to explore the phase transition of relaxor ferroelectric oxides.
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