Vibrational behavior of the M n + 1 A X n phases from first-order Raman scattering ( M = Ti , V , Cr , A = Si , X = C , N )

摘要: We report on the Raman spectra of ${\mathrm{Ti}}_{3}\mathrm{Si}{\mathrm{C}}_{2}$ (312), ${M}_{2}\mathrm{Al}\mathrm{C}\phantom{\rule{0.3em}{0ex}}(211)$ ($M=\mathrm{Ti}$, V, Cr, and Nb) ${\mathrm{Ti}}_{4}\mathrm{Al}{\mathrm{N}}_{3}$ (413), as representative compounds from family ${M}_{n+1}A{X}_{n}$ phases. Intense narrow first-order peaks are observed, we present an analysis based symmetry considerations results first-principles calculations phonon frequencies. The agreement between experimental calculated mode energies is excellent. identification modes enables application scattering a diagnostic tool for detailed study structural physical properties this their engineered solid solutions.