First and second order Raman scattering in transition metal compounds

Raman scattering investigation of nanocrystalline δ-TiNx synthesized by solid-state reaction

“…have been studied extensively by a number of authors [2][3][4][5][6] who have attributed the scattering in the acoustic range to be primarily determined by the vibration of the heavy Ti ions (typically 150-300 cm −1 ) and in the optic range by vibrations of the lighter N ions (typically 400-650 cm −1 ).…”

Pressure-induced phonon frequency shifts in transition-metal nitrides

“…22 The frequency range of high phonon density of states determined from the coherent inelastic neutron scattering 24 is from 150 to 260 cm -1 for the low-frequency acoustic branch and around 500 cm , as one would expect from nearest-neighbor forces. Therefore, we…”

Influence of the plasma nitriding conditions on the chemical and morphological characteristics of TiN coatings deposited on silicon

“…2a and 2c at 300 °C, and Figs. 2b and 2d at 350 °C for 1, 2, and 4 h. The Raman bands observed for all samples correspond to the transverse acoustic (TA), longitudinal acoustic (LA), and a combination of transverse optical (TO) and longitudinal optical (LO) TiN modes 34,35 . Cheng et al 35 have reported that scattering in the acoustic range (TA and LA modes) is associated to vibrations of the heavier Ti ions, while the scattering in the optical range (TO and LA) refers to vibrations of the lighter N ions.…”