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Licensed Unlicensed Requires Authentication Published by De Gruyter (O) 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

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

© by Oldenbourg Wissenschaftsverlag, München, Germany

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