Morphology and orientation of iron oxide precipitates in epitaxial BiFeO3 thin films grown under two non-optimized oxygen pressures

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	Morphology and orientation of iron oxide precipitates in epitaxial BiFeO3 thin films grown under two non-optimized oxygen pressures
	X. Wang; Y. L. Zhu; S. B. Mi; C. Wang; H. B. Lu; X. L. Ma
	2010
发表期刊	Philosophical Magazine
ISSN	1478-6435
卷号	90 期号:34 页码:4551-4567
摘要	Microstructures of multiferroic BiFeO3 thin films epitaxially grown on SrRuO3-buffered SrTiO3 (001) substrates by laser molecular-beam epitaxy under two non-optimized oxygen pressures were characterized by means of transmission electron microscopy. The results showed that the films grown under oxygen pressures of 1 Pa and 0.3 Pa contain a secondary phase embedded in the BiFeO3 matrix. High-angle annular dark-field imaging, elemental mapping and composition analysis in combination with selected area electron diffraction revealed that the parasitic phase is mainly antiferromagnetic -Fe2O3. The -Fe2O3 particles are semi-coherently embedded in the BiFeO3 films, as confirmed by high-resolution transmission electron microscopy. In addition to the -Fe2O3 phase, ferromagnetic Fe3O4 precipitates were found in the BiFeO3 films grown under 0.3 Pa and shown to accumulate in areas near the film/substrate interfaces. In our heteroepitaxy systems, very low density misfit dislocations were observed at the interfaces between the BiFeO3 and SrRuO3 layers implying that their misfit strains may be relieved by the formation of the secondary phases. Using X-ray photoelectron spectroscopy it was found that Fe exists in the +3 oxidation state in these films. The possible formation mechanisms of the secondary phases are discussed in terms of film growth conditions.
部门归属	[wang, x.; zhu, y. l.; mi, s. b.; ma, x. l.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [wang, c.; lu, h. b.] chinese acad sci, inst phys, beijing natl lab condensed matter phys, beijing 100190, peoples r china.;zhu, yl (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china;ylzhu@imr.ac.cn
关键词	Transmission Electron Microscopy Bismuth Ferrite Multiferroic Film Secondary Phase Microstructure Heterostructures Nanostructures
URL	查看原文
WOS记录号	WOS:000282586300006
引用统计	被引频次：6[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/31522
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. Wang,Y. L. Zhu,S. B. Mi,et al. Morphology and orientation of iron oxide precipitates in epitaxial BiFeO3 thin films grown under two non-optimized oxygen pressures[J]. Philosophical Magazine,2010,90(34):4551-4567.
APA	X. Wang,Y. L. Zhu,S. B. Mi,C. Wang,H. B. Lu,&X. L. Ma.(2010).Morphology and orientation of iron oxide precipitates in epitaxial BiFeO3 thin films grown under two non-optimized oxygen pressures.Philosophical Magazine,90(34),4551-4567.
MLA	X. Wang,et al."Morphology and orientation of iron oxide precipitates in epitaxial BiFeO3 thin films grown under two non-optimized oxygen pressures".Philosophical Magazine 90.34(2010):4551-4567.