Abstract
The temperature-dependent Raman scattering study of SAT 0.16:LA 0.04:CAT 0.8 solid solution crystal are reported. The assignment of vibrational modes in Raman spectra of investigated crystal has been proposed. The Raman spectra provided the evidence for the existence of local ordering of B-site cations in crystal structure. The most of the lattice modes of investigated SAT 0.16:LA 0.04:CAT 0.8 crystal are temperature sensitive. One of these modes (tilt mode at 240 cm −1) shows almost 20 cm −1 monotonous down-shift of frequency in investigated temperature range. However, A 1g mode possessing the largest value of FWHM is the only one blue-shifted mode with the increase temperature. Temperature-dependent Raman investigations indicate a static structural changes in SAT 0.16:LA 0.04:CAT 0.8 crystal caused by local distortions of orthorhombic structure.
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