Optical abosrption spectra of congruent LiNbO3 crystal, recorded in the vicinity of the absorption edge during heating in air

We provide the raw optical absorption spectra of a congruent LiNbO3 sample, recorded near the absorption edge during heating in air (in-situ mode). These measurements were taken using a Perkin Elmer Lambda900 spectrometer at Clausthal University of Technology. The spectra are provided in the form of the absorption coefficient α(E) (in cm⁻¹) as a function of phonon energy (in eV) at temperatures ranging from room temperature up to 1200°C, in 200K increments. For details please refer to the article: “ P. Gaczyński, Y. Suhak, S. Ganschow, S. Sanna, H. Fritze, K.-D. Becker; High-Temperature Optical Spectroscopy Study of the Fundamental Absorption Edge in the LiNbO3-LiTaO3 Solid Solution, Physica Status Solidi A (2024) 2300972; https://doi.org/10.1002/pssa.202300972"