We report on micro-Raman spectra of several mixed laser ceramics, i.e., 5at.%Tm:(ScYO) with x = 0.121, 0.252, 0.489 and 5at.%Tm:YO ceramic. The samples were fabricated by solid-state pressureless consolidation of nanopowders produced by laser ablation of solid target in air flow. In particular, we studied the influence of Sc content on the active vibration modes in terms of peak positions and shifts, linewidths and shapes: these parameters are relevant for the emission bandwidth of the laser medium. A shift towards higher frequencies is measured with the increase of the Sc content in all samples in particular in (TmYScO) where the main Raman peaks are placed at 395, 494, 635 cm while their shifts with Tm:YO are 22.6, 25.1, 40.1 cm, respectively. The assignment of the vibrational spectrum was obtained by density functional theory (DFT) with the Perdew-Burke-Enzerhof (PBE) exchange-correlation functional within the harmonic approximation framework.
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