Temperature-dependent Raman scattering study of SAT0.16:LA0.04:CAT0.8 mixed oxide perovskite crystal

The temperature-dependent Raman scattering study of SAT0.16:LA0.04:CAT0.8 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 SAT0.16:LA0.04:CAT0.8 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, A1g 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 SAT0.16:LA0.04:CAT0.8 crystal caused by local distortions of orthorhombic structure.