Spectroscopic study of mixed oxide SAT12x:LAx perovskite crystals

Mixed perovskite crystals have been grown from multicomponent melts using the Czochralski method. The Raman, FT-IR and Brillouin investigations of perovskite (1 2 x)Sr(Al0.5Ta0.5)O3:x LaAlO3 crystals are reported. The measurements have been performed for several LA concentrations in the range 0:22 # x # 0:36 at room temperature. The assignment of vibrational modes of IR and Raman spectra was proposed. The experimental results were correlated with structural data, obtained from X-ray diffraction study. The dependence of hypersonic velocity of transverse and longitudinal modes as a function of LA content was also determined. Spectroscopic investigations confirmed the disordered Al/Ta distribution, which increases with the increase of LA content. q 2004 Elsevier B.V. All rights reserved