On Raman scattering from selected M₂AC compounds

We report on the one-phonon Raman scattering spectra from the following M₂AC MAX-phase ternary carbides: Ti₂AlC, V₂AlC, Cr₂AlC, Nb₂AlC, Ta₂AlC, Ti₂InC, Hf₂InC, V₂GeC, Cr₂GeC, V₂AsC, and Nb₂AsC. We also report the results of calculations of the Γ-point, Raman-active phonon energies for these phases based on density functional theoretical simulations, including the effect of the k-point sampling on the convergence of phonon energies. Good agreement between all measured and calculated Γ-point Raman-active optical phonon energies is obtained.