Trapping of Oxygen Vacancies at Crystallographic Shear Planes in Acceptor-Doped Pb-Based Ferroelectrics.
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 ABO2.95), 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.
EMAT, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp (Belgium).
Dmitry
D
Batuk
EMAT, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp (Belgium).
Maria
M
Batuk
National Institute of Chemical Physics and Biophysics, 12618, Tallinn (Estonia).|Experimental Physics VI, EKM, University of Augsburg, 86159 Augsburg (Germany).
Alexander A
AA
Tsirlin
EMAT, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp (Belgium).
Joke
J
Hadermann
EMAT, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp (Belgium). artem.abakumov@uantwerpen.be.|Chemistry Department, Moscow State University, 119991, Moscow (Russia). artem.abakumov@uantwerpen.be.
Artem M
AM
Abakumov
doping; electron microscopy; ferroelectrics; oxygen vacancies; perovskite defects