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Title: 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, 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.
Authors:
; ;  [1] ;  [2]
  1. Materials Measurement Science Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
  2. ISIS Facility, Rutherford Appleton Laboratory, Didcot (United Kingdom)
Publication Date:
OSTI Identifier:
22299910
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 24; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; BISMUTH COMPOUNDS; FERRITES; FERROELECTRIC MATERIALS; FINE STRUCTURE; IRON OXIDES; LEAD COMPOUNDS; NEUTRONS; SCATTERING; SOLID SOLUTIONS; TETRAGONAL LATTICES; TITANATES; X RADIATION