Local structure underlying anomalous tetragonal distortions in BiFeO{sub 3}-PbTiO{sub 3} ferroelectrics

The local structure of tetragonal BiFeO{sub 3}-PbTiO{sub 3} solid solutions featuring anomalous lattice distortions has been determined using simultaneous fitting of neutron total scattering and extended X-ray absorption fine structure data. On the local scale, the large tetragonal distortion, promo...

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Bibliographic Details
Published in:Applied physics letters 2014-06, Vol.104 (24)
Main Authors: Levin, I., Krayzman, V., Woicik, J. C., Tucker, M. G.
Format: Article
Language:English
Subjects:
ABSORPTION
BISMUTH COMPOUNDS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
FERRITES
FERROELECTRIC MATERIALS
FINE STRUCTURE
IRON OXIDES
LEAD COMPOUNDS
NEUTRONS
SCATTERING
SOLID SOLUTIONS
TETRAGONAL LATTICES
TITANATES
X RADIATION
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Summary:The local structure of tetragonal BiFeO{sub 3}-PbTiO{sub 3} solid solutions featuring anomalous lattice distortions has been determined using simultaneous fitting of neutron total scattering and extended X-ray absorption fine structure data. On the local scale, the large tetragonal distortion, promoted by the displacements of the A-cations (Bi and Pb), is accommodated primarily by the [FeO{sub 6}] octahedra, even though both Fe and Ti acquire (5+1)-fold coordination. Bi cations exhibit considerably larger displacements than Pb. The combination of the A-cation displacements and the ability of M-cations to adopt 5-fold coordination is suggested as key for stabilizing the large tetragonality in BiMO{sub 3}-PbTiO{sub 3} systems.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4884946