Urbach rule and optical properties of the LiNbO3 and LiTaO3

Cabuk S., Mamedov A. M.

JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS, vol.1, no.3, pp.424-427, 1999 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 1 Issue: 3
  • Publication Date: 1999
  • Doi Number: 10.1088/1464-4258/1/3/313
  • Journal Name: JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Communication Abstracts, Metadex, DIALNET, Civil Engineering Abstracts
  • Page Numbers: pp.424-427
  • Keywords: absorption edge, Urbach rule, SRTIO3
  • Çukurova University Affiliated: Yes

Abstract

Optical spectroscopy methods are used to study the spectra of some oxygen-octahedral ferroelectrics-namely LiNbO3 and LiTaO3. It is shown that for the measured range of E and T, alpha varies exponentially with the photon energy following the empirical Urbach rule. A study of the role of the BO6-octahedron by using spectroscopic methods can cast light on the many physical phenomena that take place in LiNbO3 and LiTaO3. For these crystals, absorption edge, band gap, Urbach constants and phonon energy are found.