Polycrystalline LiNbO₃thin films characterized by infrared and Raman spectroscopy

Abstract

Thin films of lithium niobate (LiNbO 3 ) were studied by Fourier transform infrared and micro-Raman spectroscopy. The films were prepared on SiO 2 /Si substrate at substrate temperatures of 650, 700 and 750 • C from monocrystalline or sintered LiNbO 3 targets, using KrF excimer laser ablation. The films were polycrystalline. The changes of film properties and E and A 1 phonon spectra with deposition conditions were studied, and were compared with bulk data.

When Halides Come to Lithium Niobate Nanopowders Purity and Morphology Assistance

“…The different observable modes for our samples are labeled in Figure . Raman spectra show then that all of the samples have the same main signature attributed to lithium niobate: A1­(TO), A1­(LO), E­(TO), and E­(LO) modes. − Considering the different areas of the spectra, changes can be observed between the three products. Peaks below 150 cm –1 and at around 700 cm –1 are attributed to the LiNb 3 O 8 phase .…”

Photoluminescent Ferroelectric LiNbO3 Crystals Grown from MXenes

“…The additional peaks at 255, 271, 316, 333, 367, 432, and 576 cm −1 respectively correspond to the modes of E TO3 , A 1(TO2) , E TO4 , A 1(TO3) , E TO5 , E TO7 , and E TO8 . [ 29 ]…”

“…The additional peaks at 255, 271, 316, 333, 367, 432, and 576 cm −1 respectively correspond to the modes of E TO3 , A 1(TO2) , E TO4 , A 1(TO3) , E TO5 , E TO7 , and E TO8 . [29] Figure 4a presents the UV-vis absorption spectrum of M-LN crystals, which presents an absorption at 340 nm within the 200-900 nm range. The bandgap of M-LN is evaluated and its measured value is ≈3.66 eV, which is almost as same as that of ceramic LiNbO 3 (≈3.7 eV).…”