Virginia TechWelsch, A. M.Maier, B. J.Engel, J. M.Mihailova, B.Angel, R. J.Paulmann, C.Gospodinov, M.Friedrich, A.Stosch, R.Guttler, B.Petrova, D.Bismayer, U.2014-02-112014-02-112009-09-28Welsch, A. -M. ; Maier, B. J. ; Engel, J. M. ; et al., Sep 2009. "Effect of Ba incorporation on pressure-induced structural changes in the relaxor ferroelectric PbSc0.5Ta0.5O3," PHYSICAL REVIEW B 80(10): 104118. DOI: 10.1103/PhysRevB.80.1041181098-0121http://hdl.handle.net/10919/25368Pressure-induced structural changes in the canonical relaxor Pb0.78Ba0.22Sc0.5Ta0.5O3 were studied with both in-house and synchrotron single-crystal x-ray diffraction as well as Raman spectroscopy at pressures up to 9.8 GPa. The results reveal that the substitution of Ba for Pb in ABO(3) perovskite-type structures, i.e., the substitution of a two-valent element with an isotropic electron shell for an isovalent element with a stereochemically active lone pair, leads to a "diffuse pressure-induced phase transition," a structural transformation over a broad pressure range, without a well-defined critical pressure point. The smeared phase transition of the average structure results from the existence of local structural deformations in the vicinity of A-positioned Ba cations.en-USIn Copyrightphase-transitionscrystallographyanorthitePhysicsArticle - Refereedhttp://link.aps.org/doi/10.1103/PhysRevB.80.104118https://doi.org/10.1103/PhysRevB.80.104118