Title
Trapping of oxygen vacancies at crystallographic shear planes in acceptor-doped Pb-based ferroelectrics Trapping of oxygen vacancies at crystallographic shear planes in acceptor-doped Pb-based ferroelectrics
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Weinheim ,
Subject
Chemistry
Source (journal)
Angewandte Chemie: international edition in English. - Weinheim
Volume/pages
54(2015) :49 , p. 14787-14790
ISSN
1433-7851
ISI
000367723400031
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The defect chemistry of the ferroelectric material PbTiO3 after doping with Fe-III acceptor ions is reported. Using advanced transmission electron microscopy and powder X-ray and neutron diffraction, we demonstrate that even at concentrations as low as circa 1.7% (material composition approximately ABO(2.95)), the oxygen vacancies are trapped into extended planar defects, specifically crystallographic shear planes. We investigate the evolution of these defects upon doping and unravel their detailed atomic structure using the formalism of superspace crystallography, thus unveiling their role in nonstoichiometry in the Pb-based perovskites.
E-info
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https://repository.uantwerpen.be/docman/iruaauth/f5f9e4/131104.pdf
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