Urbach rule and optical properties of the LiNbO<sub>3</sub> and LiTaO<sub>3</sub>
Süleyman Çabuk; Amirullah Mamedov; Süleyman Çabuk; Department of Physics, Faculty of Arts and Sciences, Çukurova University 01330, Adana, Turkey; Amirullah Mamedov; Department of Physics, Faculty of Arts and Sciences, Çukurova University 01330, Adana, Turkey
Журнал:
Journal of Optics A: Pure and Applied Optics
Дата:
1999-05-01
Аннотация:
Optical spectroscopy methods are used to study the spectra of some oxygen-octahedral ferroelectrics - namely LiNbO<sub>3</sub> and LiTaO<sub>3</sub>. It is shown that for the measured range of E and T, varies exponentially with the photon energy following the empirical Urbach rule. A study of the role of the BO<sub>6</sub>-octahedron by using spectroscopic methods can cast light on the many physical phenomena that take place in LiNbO<sub>3</sub> and LiTaO<sub>3</sub>. For these crystals, absorption edge, band gap, Urbach constants and phonon energy are found.
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