Low temperature structural variations of Na0.5Bi0.5TiO3-7%BaTiO3 single crystal: Evidences from optical ellipsometry and Raman scattering
作者： T. Huang , S. Guo , L. P. Xu , C. Chen , H. S. Luo
DOI: 10.1063/1.4922424
关键词:
摘要: Optical properties and structural variations of Na0.5Bi0.5TiO3-7%BaTiO3 (NBT-7%BT) single crystal have been studied by temperature-dependent optical ellipsometry Raman spectroscopy from 4.2 to 300 K. The second derivative the complex dielectric functions reveals two interband transitions ( Ecp1 Ecp2) located at about 3.49 4.25 eV, respectively. Depending on temperature evolution electronic transitions, appear near 60, 150, 240 K, These anomalies are also well illustrated low-frequency phonon modes involving vibrations Bi. low-temperature NBT-7%BT can be associated with instability crystalline lattice driven off-centered Bi ions, followed polarizability unit cells.
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