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Structural and magn...
Structural and magnetic properties of isovalently substituted multiferroic BiFeO3 : Insights from Raman spectroscopy
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- Bielecki, Johan, 1982 (author)
- Dept of applied physics, CHT, Göteborg,Chalmers tekniska högskola,Chalmers University of Technology
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- Svedlindh, Peter (author)
- Uppsala universitet,Fasta tillståndets fysik
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- Tibebu, Dessie (author)
- Dept of chemical and biological engineering, CTH, Göteborg,Chalmers tekniska högskola,Chalmers University of Technology
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- Cai, Shengzhen (author)
- Dept of chemical and biological engineering, CTH, Göteborg,Chalmers tekniska högskola,Chalmers University of Technology
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- Eriksson, Sten, 1958 (author)
- Dept of chemical and biological engineering, CTH, Göteborg,Chalmers tekniska högskola,Chalmers University of Technology
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- Börjesson, Lars, 1957 (author)
- Dept of applied physics, CHT, Göteborg,Chalmers tekniska högskola,Chalmers University of Technology
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- Knee, Christopher, 1973 (author)
- Dept of chemical and biological engineering, CTH, Göteborg,Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2012
- 2012
- English.
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In: Physical Review B Condensed Matter. - 0163-1829 .- 1095-3795. ; 86:184422
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Abstract
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- Raman spectra, supplemented by powder x-ray diffraction and magnetization data of isovalently A- and B-site substituted BiFeO3 in the Bi1−xLaxFeO3 (0≤x≤1), Bi1−xTbxFeO3 (0≤x≤0.2), and Bi0.9Sm0.1Fe1−xMnxO3 (0≤x≤0.3) series, are presented. A good agreement between the structural transitions observed by x-ray diffraction and the vibrational modes observed in the Raman spectra is found over the whole substitutional ranges, and in particular we find spectroscopic signatures of a PbZrO3-type structure for Bi0.8La0.2FeO3. Mode assignments in the substituted materials are made based on Raman spectra of the end-members BiFeO3 and LaFeO3. Moreover, by comparing spectra from all samples with R3c structure, the phonon assignment in BiFeO3 is revisited. A close connection between the degree of octahedral tilt and the Raman shift of the A1 oxygen a−a−a− tilt mode is established. An explanation for the strong second-order scattering observed in Bi1−xLaxFeO3 and Bi1−xTbxFeO3 is suggested, including the assignment of the previously mysterious BiFeO3 mode at 620 cm−1. Finally, the magnetization data indicates a transition from a cycloidal modulated state towards a canted antiferromagnet with increasing A-site substitution, while Bi0.9Sm0.1Fe1−xMnxO3 with x=0 and 0.15 exhibit an anomalous closing of the hysteresis loop at low temperatures. For low A-site substitution levels (x≤0.1) the decreasing Raman intensity of the Fe derived modes correlates with the partial destruction of the spin cycloid as the substitution level increases.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- Teknisk fysik med inriktning mot fasta tillståndets fysik
- Engineering Science with specialization in Solid State Physics
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Bielecki, Johan, ...
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Svedlindh, Peter
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Tibebu, Dessie
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Cai, Shengzhen
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Eriksson, Sten, ...
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Börjesson, Lars, ...
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show more...
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Knee, Christophe ...
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- About the subject
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Materials Engine ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
- Articles in the publication
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Physical Review ...
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Physical Review ...
- By the university
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Uppsala University
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Chalmers University of Technology