OPTICAL PROPERTIES AND BAND STRUCTURE OF SRTIO3 AND BATIO3
OPTICAL PROPERTIES AND BAND STRUCTURE OF SRTIO3 AND BATIO3
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DOI：
10.1103/physrev.140.a651
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发表时间：
1965-01-01
期刊：
影响因子：
--
通讯作者：
CARDONA, M
中科院分区：
文献类型：
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作者：
CARDONA, M
本文报道了SrTiO 3和BaTiO 3的正入射反射光谱和用Kramers-Kronig方法求得的光学常数。这些光谱与金红石的光谱非常相似。最强的光学跃迁（A）发生在约4.4 eV处：它们是在基本吸收边（3.2 eV）以下观察到的色散的原因。这些光谱的材料的能带结构的一个尝试性的解释。A峰似乎是由于在布里渊区的X点处氧的2 p能级和钛的3s能级之间的跃迁。A峰的分裂被分配到立方场中氧的2 p能级的分裂。还观察到2 p氧和4s钛能级之间、2s氧和3d钛能级之间以及2s氧和5s钛或6s钡能级之间的跃迁。等离子体振荡在21 eV左右。
The normal-incidence reflectance spectra of SrTi O 3 and BaTi O 3 and the optical constants derived by the Kramers-Kronig method are reported. These spectra are very similar to those of rutile. The strongest optical transitions (A) occur at about 4.4 eV: They are responsible for the dispersion observed below the fundamental absorption edge (3.2 eV). A tentative interpretation of these spectra in terms of the energy band structure of the materials is offered. The A peak seems due to transitions between 2 p levels of oxygen and 3 s levels of titanium at the X point of the Brillouin zone. The splitting of the A peak is assigned to the splitting of the 2 p levels of the oxygen in the cubic field. Transitions between 2 p oxygen and 4 s titanium levels, between 2 s oxygen and 3 d titanium levels, and between 2 s oxygen and 5 s titanium or 6 s barium levels are also observed. Plasma oscillations are seen around 21 eV.