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Origin of superstructures in (double) perovskite thin films

Shabadi, V. and Major, M. and Komissinskiy, P. and Vafaee, M. and Radetinac, A. and Baghaie Yazdi, M. and Donner, W. and Alff, L. (2014):
Origin of superstructures in (double) perovskite thin films.
In: Journal of Applied Physics, AIP Publishing LLC, p. 114901, 116, (11), ISSN 0021-8979, [Online-Edition: http://dx.doi.org/10.1063/1.4895636],
[Article]

Abstract

We have investigated the origin of superstructure peaks as observed by X-ray diffraction of multiferroic Bi(Fe0.5Cr0.5)O3 thin films grown by pulsed laser deposition on single crystal SrTiO3 substrates. The photon energy dependence of the contrast between the atomic scattering factors of Fe and Cr is used to rule out a chemically ordered double perovskite Bi2FeCrO6 (BFCO). Structural calculations suggest that the experimentally observed superstructure occurs due to unequal cation displacements along the pseudo-cubic [111] direction that mimic the unit cell of the chemically ordered compound. This result helps to clarify discrepancies in the correlations of structural and magnetic order reported for Bi2FeCrO6. The observation of a superstructure in itself is not a sufficient proof of chemical order in double perovskites.

Item Type: Article
Erschienen: 2014
Creators: Shabadi, V. and Major, M. and Komissinskiy, P. and Vafaee, M. and Radetinac, A. and Baghaie Yazdi, M. and Donner, W. and Alff, L.
Title: Origin of superstructures in (double) perovskite thin films
Language: English
Abstract:

We have investigated the origin of superstructure peaks as observed by X-ray diffraction of multiferroic Bi(Fe0.5Cr0.5)O3 thin films grown by pulsed laser deposition on single crystal SrTiO3 substrates. The photon energy dependence of the contrast between the atomic scattering factors of Fe and Cr is used to rule out a chemically ordered double perovskite Bi2FeCrO6 (BFCO). Structural calculations suggest that the experimentally observed superstructure occurs due to unequal cation displacements along the pseudo-cubic [111] direction that mimic the unit cell of the chemically ordered compound. This result helps to clarify discrepancies in the correlations of structural and magnetic order reported for Bi2FeCrO6. The observation of a superstructure in itself is not a sufficient proof of chemical order in double perovskites.

Journal or Publication Title: Journal of Applied Physics
Volume: 116
Number: 11
Publisher: AIP Publishing LLC
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology
11 Department of Materials and Earth Sciences > Material Science > Structure Research
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 17 Nov 2014 13:27
Official URL: http://dx.doi.org/10.1063/1.4895636
Identification Number: doi:10.1063/1.4895636
Funders: V.S. acknowledges a fellowship from the German Academic Exchange Service (DAAD).
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