Qin, Y. B., Yang, H. X., Zhang, Y., Tian, H. F., Ma, C., Zhao, Y. G., Walton, Richard I. and Li, J. Q.. (2009) The effect of Mg doping on the structural and physical properties of LuFe2O4 and Lu2Fe3O7. Journal of Physics: Condensed Matter, Vol.21 (No.1). article no. 5401. ISSN 0953-8984

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Abstract

The structural and physical properties of the recently discovered electronic ferroelectric materials LuFe2O4 and Lu2Fe3O7 have been investigated for Mg substitution of Fe. X-ray diffraction data demonstrate that the lattice parameters in both systems change progressively with increasing Mg content, with a smaller unit cell volume on replacing Fe2+ by Mg2+. X-ray absorption near-edge spectroscopy experiments at the Fe K-edge show that the average Fe oxidation state is slightly increased along with Mg doping in Lu2Fe3O7 materials, consistent with isomorphous replacement of Fe2+ by Mg2+. Measurements of dielectric properties demonstrate that Mg doping could have an effect on the electron hopping energy between Fe2+ and Fe3+ ions. Transmission electron microscopy and magnetization analysis reveal that Mg doping in LuFe2O4 has a much greater influence than in Lu2Fe3O7 on both the charge ordering and the low-temperature magnetic properties.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Chemistry
Library of Congress Subject Headings (LCSH):	Ferromagnetic materials, Ferroelectric devices -- Materials, Magnesium, Lutetium, Semiconductor doping , Dielectrics
Journal or Publication Title:	Journal of Physics: Condensed Matter
Publisher:	Institute of Physics Publishing Ltd.
ISSN:	0953-8984
Date:	7 January 2009
Volume:	Vol.21
Number:	No.1
Number of Pages:	7
Page Range:	article no. 5401
Identification Number:	10.1088/0953-8984/21/1/015401
Status:	Peer Reviewed
Publication Status:	Published
Funder:	Guo jia zi ran ke xue ji jin wei yuan hui (China) [National Natural Science Foundation of China] (NSFC), Zhongguo ke xue yuan [Chinese Academy of Sciences] (CAS), China. Guo jia ke xue ji shu bu [Ministry of Science and Technology]
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URI:	http://wrap.warwick.ac.uk/id/eprint/28907

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