Virginia TechMihailova, B.Angel, R. J.Welsch, A. M.Zhao, J.Engel, J.Paulmann, C.Gospodinov, M.Ahsbahs, H.Stosch, R.Guttler, B.Bismayer, U.2013-12-102013-12-102008-07-04Mihailova, B. ; Angel, R. J. ; Welsch, A. -M. ; et al., Jul 4, 2008. “Pressure-induced phase transition in PbSc0.5Ta0.5O3 as a model Pb-based perovksite-type relaxor ferroelectric,” PHYSICAL REVIEW LETTERS 101(1): 017602. DOI: 10.1103/PhysRevLett.101.0176020031-9007http://hdl.handle.net/10919/24505We report pressure-induced structural changes in PbSc0.5Ta0.5O3 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 p(c)similar to 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.en-USIn CopyrightperovskitescrossoverPhysicsArticle - Refereedhttp://link.aps.org/doi/10.1103/PhysRevLett.101.017602https://doi.org/10.1103/PhysRevLett.101.017602