Pressure-induced phase transition in PbSc0.5Ta0.5O3 as a model Pb-based perovksite-type relaxor ferroelectric.

نویسندگان

  • B Mihailova
  • R J Angel
  • A-M Welsch
  • J Zhao
  • J Engel
  • C Paulmann
  • M Gospodinov
  • H Ahsbahs
  • R Stosch
  • B Güttler
  • U Bismayer
چکیده

We report pressure-induced structural changes in PbSc(0.5)Ta(0.5)O3 studied by single-crystal x-ray diffraction and Raman scattering. The appearance of a soft mode, a change in the volume compressibility, broadening of the diffraction peaks, and suppression of the x-ray diffuse scattering show that a phase transition occurs near pc approximately 1.9 GPa. The critical pressure is associated with a decoupling of the displacements of the B site and Pb cations in the existing polar nanoregions, leading to the suppression of B-cation off-center shifts and enhancement of the ferroic distortion in the Pb-O system.

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عنوان ژورنال:
  • Physical review letters

دوره 101 1  شماره 

صفحات  -

تاریخ انتشار 2008