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), p. 114901. AIP Publishing LLC, ISSN 0021-8979,
[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. ; Major, M. ; Komissinskiy, P. ; Vafaee, M. ; Radetinac, A. ; Baghaie Yazdi, M. ; Donner, W. ; 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 of the journal: | 116 |
| Issue 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 |
| URL / URN: | http://dx.doi.org/10.1063/1.4895636 |
| Identification Number: | doi:10.1063/1.4895636 |
| PPN: | |
| Funders: | V.S. acknowledges a fellowship from the German Academic Exchange Service (DAAD). |
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