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Keywords:

  • optical interband transitions;
  • phonons;
  • Raman spectra;
  • single crystals;
  • Zn2TiO4

Abstract

A high-quality Zn2TiO4 crystal was used as a prototype for determination of the optical interband transitions by measuring the absorption spectrum of the crystal along the a-axes at room temperature in the range of 200–1000 nm. Based on the theory of band-to-band transitions, the indirect energy gap and the phonon energy were determined as Egi = 3.29 eV and Ep = 0.09 eV, respectively. Also, this phonon was just the vibrational mode at 721 cm−1 in the Raman spectra, which participated in the indirect transitions of the Zn2TiO4.