Structural properties of a mixed valence compound Fe2 BO4

S. Shimomura; S. Nakamura; N. Ikeda; E. Kaneko; K. Kato; K. Kohn

doi:10.1016/j.jmmm.2006.10.184

Structural properties of a mixed valence compound Fe₂ BO₄

S. Shimomura, S. Nakamura, N. Ikeda, E. Kaneko, K. Kato, K. Kohn

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

We have performed X-ray powder diffraction measurements in a mixed valence compound of Fe₂ BO₄ using synchrotron radiation. The diffraction patterns obtained at several temperatures between 85 and 386 K were analyzed by the Rietveld method. The monoclinic-orthorhombic transition, ascribed to charge-ordering of Fe^{2 +} and Fe^{3 +} ions, was confirmed by the temperature dependence of the monoclinic angle β. No superlattice reflection due to the charge-ordering was detected. The temperature dependences of the lattice parameters show anomalies around 270 K as well as the monoclinic-orthorhombic transition temperature of 327-347 K. The structural change around 270 K is attributable to the onset of the partial charge-delocalization.

Original language	English
Pages (from-to)	793-795
Number of pages	3
Journal	Journal of Magnetism and Magnetic Materials
Volume	310
Issue number	2 SUPPL. PART 1
DOIs	https://doi.org/10.1016/j.jmmm.2006.10.184
Publication status	Published - Mar 2007
Externally published	Yes

Keywords

Charge ordering
Fe BO
Mixed valence
Phase transition
X-ray diffraction

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1016/j.jmmm.2006.10.184

Cite this

@article{01c7ba52bece43f8bb30f1d3a118426b,

title = "Structural properties of a mixed valence compound Fe2 BO4",

abstract = "We have performed X-ray powder diffraction measurements in a mixed valence compound of Fe2 BO4 using synchrotron radiation. The diffraction patterns obtained at several temperatures between 85 and 386 K were analyzed by the Rietveld method. The monoclinic-orthorhombic transition, ascribed to charge-ordering of Fe2 + and Fe3 + ions, was confirmed by the temperature dependence of the monoclinic angle β. No superlattice reflection due to the charge-ordering was detected. The temperature dependences of the lattice parameters show anomalies around 270 K as well as the monoclinic-orthorhombic transition temperature of 327-347 K. The structural change around 270 K is attributable to the onset of the partial charge-delocalization.",

keywords = "Charge ordering, Fe BO, Mixed valence, Phase transition, X-ray diffraction",

author = "S. Shimomura and S. Nakamura and N. Ikeda and E. Kaneko and K. Kato and K. Kohn",

note = "Funding Information: This work was partly supported by a Grant-in-Aid for Science Research from the Ministry of Education, Science, Sports and Culture, Japan. The synchrotron radiation experiment was performed at the SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal no. 2004A0347-ND1a-np).",

year = "2007",

month = mar,

doi = "10.1016/j.jmmm.2006.10.184",

language = "English",

volume = "310",

pages = "793--795",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier",

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T1 - Structural properties of a mixed valence compound Fe2 BO4

AU - Shimomura, S.

AU - Nakamura, S.

AU - Ikeda, N.

AU - Kaneko, E.

AU - Kato, K.

AU - Kohn, K.

N1 - Funding Information: This work was partly supported by a Grant-in-Aid for Science Research from the Ministry of Education, Science, Sports and Culture, Japan. The synchrotron radiation experiment was performed at the SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal no. 2004A0347-ND1a-np).

PY - 2007/3

Y1 - 2007/3

N2 - We have performed X-ray powder diffraction measurements in a mixed valence compound of Fe2 BO4 using synchrotron radiation. The diffraction patterns obtained at several temperatures between 85 and 386 K were analyzed by the Rietveld method. The monoclinic-orthorhombic transition, ascribed to charge-ordering of Fe2 + and Fe3 + ions, was confirmed by the temperature dependence of the monoclinic angle β. No superlattice reflection due to the charge-ordering was detected. The temperature dependences of the lattice parameters show anomalies around 270 K as well as the monoclinic-orthorhombic transition temperature of 327-347 K. The structural change around 270 K is attributable to the onset of the partial charge-delocalization.

AB - We have performed X-ray powder diffraction measurements in a mixed valence compound of Fe2 BO4 using synchrotron radiation. The diffraction patterns obtained at several temperatures between 85 and 386 K were analyzed by the Rietveld method. The monoclinic-orthorhombic transition, ascribed to charge-ordering of Fe2 + and Fe3 + ions, was confirmed by the temperature dependence of the monoclinic angle β. No superlattice reflection due to the charge-ordering was detected. The temperature dependences of the lattice parameters show anomalies around 270 K as well as the monoclinic-orthorhombic transition temperature of 327-347 K. The structural change around 270 K is attributable to the onset of the partial charge-delocalization.

KW - Charge ordering

KW - Fe BO

KW - Mixed valence

KW - Phase transition

KW - X-ray diffraction

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EP - 795

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JF - Journal of Magnetism and Magnetic Materials

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