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Relaxors – phonon anomalies at ambient p and T prototype structure Fm3m F1u F1u Pb-localised BO3 translation vs Pb B-cation localised Pb-O bond stretching BO6 bending p-pol c-pol F 1u F 1u E g BO 6 stretching A 1g F 2g F 2u Pb-localised BO3 translation vs Pb B-localised Pb-O bond stretching BO6 bending BO6 str. bold: E i || [100] thin: E i || [110] F 2g PST PSN 300-350 cm -1 (Pb-O stretching): correlated ferroic Pb-O species Raman-activity near 250 cm -1 : off-centre shifts of B-cations
PbSc 0.5Ta 0.5O 3 (PST) and Pb 0.78 Ba 0.22 Sc 0.5 Ta 0.5 O 3 (PBST) at AP Why those two compounds? PST PBST relaxor with long-range FE ordering at LT canonical relaxor
Page 1 and 2: 1. Berichtskolloquium des SPP 1236,
Page 3 and 4: Outline 1. Relaxor ferroelectrics s
Page 5 and 6: Relaxor ferroelectrics - complex na
Page 7: Our general goals Raman scattering
Page 11 and 12: Our research plan (next 12 months)

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