The valence and site occupancy of substituting metals in magnetite spinel structure Fe3-xMxO4 (M = Cr, Mn, Co and Ni) and their influence on thermal stability: An XANES and TG-DSC investigation

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	The valence and site occupancy of substituting metals in magnetite spinel structure Fe3-xMxO4 (M = Cr, Mn, Co and Ni) and their influence on thermal stability: An XANES and TG-DSC investigation
	Liang, Xiaoliang; Zhong, Yuanhong; Zhu, Sanyuan; He, Hongping; Yuan, Peng; Zhu, Jianxi; Jiang, Zheng
	2013
Source Publication	SOLID STATE SCIENCES
ISSN	1293-2558
Volume	15 Pages:CONCATENATE(Sheet1!I368,-Sheet1!J368)
Abstract	Four series of substituted magnetite (Fe3-xMxO4, M = Cr, Mn, Co and Ni) were characterized by X-ray diffraction (XRD), X-ray absorption near-edge structure (XANES) spectroscopy, and thermogravimetry and differential thermal analysis (TG-DSC). XRD patterns confirmed the formation of samples with the spine! structure. XANES showed the valence and site occupancy of the substituting cations. Cr cations are in the valence of +3 and occupy the octahedral sites. The valences of Mn cation are +2 and +3. Mn2+ and Mn3+ cations preferentially entered the tetrahedral and octahedral sites, respectively. Both Co and Ni cations have a valence of +2 and mainly occupy the octahedral sites. The introduction of Cr and Ni cations obviously increases the amount of superficial hydroxyl groups. The incorporation of Mn, Co and Ni enhances the oxidation temperature of magnetite. All the four kinds of substituting cations in this study increase the temperature of phase transformation from maghemite (gamma-Fe2O3) to hematite (alpha-Fe2O3). The mechanism of substitution changing the temperatures of oxidation and phase transformation was also discussed. (C) 2012 Elsevier Masson SAS. All rights reserved.
Indexed By	SCI
Language	英语
Funding Project	应物所项目组
WOS ID	WOS:000315070700019
Citation statistics
Document Type	期刊论文
Identifier	http://ir.sinap.ac.cn/handle/331007/13644
Collection	中科院上海应用物理研究所2011-2020年
Recommended Citation GB/T 7714	Liang, Xiaoliang,Zhong, Yuanhong,Zhu, Sanyuan,et al. The valence and site occupancy of substituting metals in magnetite spinel structure Fe3-xMxO4 (M = Cr, Mn, Co and Ni) and their influence on thermal stability: An XANES and TG-DSC investigation[J]. SOLID STATE SCIENCES,2013,15:CONCATENATE(Sheet1!I368,-Sheet1!J368).
APA	Liang, Xiaoliang.,Zhong, Yuanhong.,Zhu, Sanyuan.,He, Hongping.,Yuan, Peng.,...&Jiang, Zheng.(2013).The valence and site occupancy of substituting metals in magnetite spinel structure Fe3-xMxO4 (M = Cr, Mn, Co and Ni) and their influence on thermal stability: An XANES and TG-DSC investigation.SOLID STATE SCIENCES,15,CONCATENATE(Sheet1!I368,-Sheet1!J368).
MLA	Liang, Xiaoliang,et al."The valence and site occupancy of substituting metals in magnetite spinel structure Fe3-xMxO4 (M = Cr, Mn, Co and Ni) and their influence on thermal stability: An XANES and TG-DSC investigation".SOLID STATE SCIENCES 15(2013):CONCATENATE(Sheet1!I368,-Sheet1!J368).

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