Mihailova
Mihailova Mihailova
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)
Relaxors – phonon anomalies at ambient p and T<br />
prototype structure Fm3m<br />
F1u F1u Pb-localised<br />
BO3 translation vs Pb<br />
B-cation localised<br />
Pb-O bond stretching<br />
BO6 bending<br />
p-pol c-pol<br />
F 1u<br />
F 1u<br />
E g<br />
BO 6 stretching<br />
A 1g<br />
F 2g<br />
F 2u<br />
Pb-localised<br />
BO3 translation vs Pb<br />
B-localised<br />
Pb-O bond stretching<br />
BO6 bending<br />
BO6 str.<br />
bold: E i || [100]<br />
thin: E i || [110]<br />
F 2g<br />
PST<br />
PSN<br />
300-350 cm -1 (Pb-O stretching):<br />
correlated ferroic Pb-O species<br />
Raman-activity near 250 cm -1 :<br />
off-centre shifts of B-cations
Change language