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The anomalous behavior of the linewidth (damping constant) for the Raman A g  modes of 223 cm −1  and 260 cm −1  that contribute to the phase transition mechanism of SrSnO 3  ceramic close to the phase transition temperatures of T C1 = 650 K and T C2 = 530 K, respectively, was calculated as function of temperature from the pseudospin-phonon coupled (PS) and the energy fluctuation (EF) models below (T &lt; T C ) and above (T &gt; T C ) the phase transition temperatures of T C1  and T C2 . For this calculation, the frequency shift of these modes were associated as the order parameter and disorder parameter below and above T C , respectively. Our results are in good agreement with the observed linewidth of these 223 cm −1  and 260 cm −1  Raman A g  modes. In addition, these two models (PS and EF) were used to deduce the values of the activation energy for SrSnO 3  ceramic below and above the phase transition temperatures of T C1  and T C2 .

Investigation of the anomalous behavior of the linewidth (damping constant) for the Raman A g modes in SrSnO 3 ceramic