4.6 Article

Spectroscopic ellipsometry study of Bi12TiO20 single crystals

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Summary: The study discusses the structural and optical characteristics of Bi12TiO20 single crystals grown by Czochralski method, revealing sharp X-ray diffraction patterns and Raman spectra peaks. The direct bandgap energy of Bi12TiO20 was found to increase as temperature decreased. The temperature-dependent bandgap characteristics were analyzed using Varshni and O'Donnell-Chen models, determining the absolute zero bandgap energy, rate of change of bandgap energy, and average phonon energy.

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