Lattice dynamics study of high-quality strontium bismuth tantalate single crystals

resumo

Raman scattering was investigated in high-quality SrBi2Ta2O9 (SBT) single crystals prepared by the self-flux solution method. The Raman spectra in the range 6-1800 cm(-1) were monitored as a function of temperature both below and above the ferroelastic-ferroelectric phase transition at about 600 K. The behaviour of the soft ferroelectric mode and of its damping coefficient near the phase transition indicates a strong coupling with an acoustical phonon. The results provide clear evidence for a crossing over from a displacive to an order-disorder component and they are discussed in terms of a complex sequence of the phase transitions in SBT.

palavras-chave

FERROELECTRIC PHASE-TRANSITION; LAYERED PEROVSKITE SRBI2TA2O9; ELECTRONIC-STRUCTURE; THIN-FILMS; RAMAN; CERAMICS

categoria

Physics

autores

Almeida, A; Chaves, MR; Amorin, H; Costa, MEV; Kholkin, AL

nossos autores

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