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Origin of superstructures in (double) perovskite thin films

Shabadi, V. ; Major, M. ; Komissinskiy, P. ; Vafaee, M. ; Radetinac, A. ; Baghaie Yazdi, M. ; Donner, W. ; Alff, L. (2014)
Origin of superstructures in (double) perovskite thin films.
In: Journal of Applied Physics, 116 (11)
doi: 10.1063/1.4895636
Article, Bibliographie

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. ; Major, M. ; Komissinskiy, P. ; Vafaee, M. ; Radetinac, A. ; Baghaie Yazdi, M. ; Donner, W. ; Alff, L.
Type of entry: Bibliographie
Title: Origin of superstructures in (double) perovskite thin films
Language: English
Date: 2014
Publisher: AIP Publishing LLC
Journal or Publication Title: Journal of Applied Physics
Volume of the journal: 116
Issue Number: 11
DOI: 10.1063/1.4895636
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.

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
Last Modified: 17 Nov 2014 13:27
PPN:
Funders: V.S. acknowledges a fellowship from the German Academic Exchange Service (DAAD).
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