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PST and PBST at HP Raman scattering, X-ray X ray diffraction and diffuse scattering AP - 9 GPa : • enhancement of the anisotropy in the Pb-O system • suppression of B-cation off-centre shifts PbSc 0.5Ta 0.5Ta0.5 0.5 O3 new! new! Pb 0.78Ba 0.78Ba0.22Sc 0.22Sc0.5Ta 0.5Ta0.5 0.5 O3 a sequence of local structural changes between 1.2 - 3.5 GPa reversible phase transition near 2.0 GPa (submitted for publication) new canonical relaxor! relaxor two types of Pb-O bonds revealed by pressure stiff octahedral distortions near the incorporated Ba cations responsible for the suppression of long-range FE ordering (to be submitted for publication)
Our research plan (next 12 months) HP Raman spectroscopy on PST and Ba-PST up to 15 GPa (an attempt to collect polarised spectra < 4 GPa) Analysis of the XRD data on PST and Ba-PST collected at DESY Pressure-induced structural transformations in PSN and Nb-doped PST (Raman scattering and XRD analysis) Ba-PSN and Ba-PST-PSN (Raman scattering) La-PST and La-PSN (Raman scattering)
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 and 8: Our general goals Raman scattering
Page 9: PbSc 0.5Ta 0.5O 3 (PST) and Pb 0.78

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