2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/94739Experimental data obtained by Lughi and Clarke [J. Am. Ceram. Soc., 88, 2552 (2005)] are compared to the theory describing disorder effects on optical phonons. Sharpening and vanishing of the asymmetry of the Raman lines after annealing are attributed to a decrease in short-range disorder. The parameters of disorder (such as the phonon-defect coupling and the correlation length) are defined in the comparison.11 pages, 3 figuresMaterials ScienceDisordered Systems and Neural Networkstext