Accessible Requires Authentication Published by Oldenbourg Wissenschaftsverlag January 24, 2013

Layered oxygen vacancy ordering in Nb-doped SrCo1-xFexO3-δ perovskite

Senne Van Rompaey, Walid Dachraoui, Stuart Turner, Olga Yu. Podyacheva, Haiyan Tan, Jo Verbeeck, Artem Abakumov and Joke Hadermann
From the journal

Abstract

The crystal structure of SrCo0.7Fe0.2Nb0.1O2.72 was determined using a combination of precession electron diffraction (PED), high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM) and spatially resolved electron energy loss spectroscopy (STEM-EELS). The structure has a tetragonal P4/mmm symmetry with cell parameters a = b = ap, c = 2ap (ap being the cell parameter of the perovskite parent structure). Octahedral BO2 layers alternate with the anion-deficient BO1.4 layers, the different B cations are randomly distributed over both layers. The specific feature of the SrCo0.7Fe0.2Nb0.1O2.72 microstructure is a presence of extensive nanoscale twinning resulting in domains with alignment of the tetragonal c-axis along all three cubic direction of the perovskite subcell.


* Correspondence address: University of Antwerp, EMAT, Groenenborgerlaan 171, 2020 Antwerp, Belgien,

Published Online: 2013-01-24
Published in Print: 2013-01

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