Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 17, Issue 48, Pages 7605-7612Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/17/48/012
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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.
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