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Crystal structure of LaSr3Fe3O9 and its phase relation with LaSr3Fe3O10

Fjellvåg, Øystein; Øygarden, Vegar; Sørby, Magnus Helgerud; Sjåstad, Anja Olafsen
Peer reviewed, Journal article
Accepted version
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URI
https://hdl.handle.net/11250/2642053
Date
2019
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Original version
Journal of Solid State Chemistry. 2019, 275 56-62.   10.1016/j.jssc.2019.03.050
Abstract
The Ruddlesden-Popper phase LaSr3Fe3O10 and its reduced derivatives with nominal composition LaSr3Fe3O10–x, with 0 < x < 1.21, are described in detail with respect to crystal structure, magnetic order, thermal stability and likely vacancy mechanisms. The crystal structure of the LaSr3Fe3O9 (x = 1) phase is described. The LaSr3Fe3O10-δ phase prevails for x < 0.51, whereas LaSr3Fe3O9±ε prevails for x > 0.85. The phases are separated by a two-phase region 0.51 < x < 0.85. By combined Rietveld refinements of high-resolution powder synchrotron and neutron diffraction, the crystallographic and magnetic structure of LaSr3Fe3O9 is described. LaSr3Fe3O9 takes a layer like RP3 type structure with features of the brownmillerite structure in the triple perovskite type slabs; unit cell dimensions a = 28.7562(13) Å, b = 5.5280(2) Å, c = 5.4583(2) Å, space group Cmcm. LaSr3Fe3O9 is an antiferromagnet with TN > 350 K and with a G-type magnetic structure, magnetic space group PCbcm. Based on unit cell volume considerations, local oxygen vacancy ordering schemes are suggested.
Journal
Journal of Solid State Chemistry
Copyright
©2019 Elsevier Inc. All rights reserved.

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