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Study of Al-substituted hematites, prepared from thermal treatment of lepidocrocite

Erwin Van San, Eddy De Grave UGent, Robert Vandenberghe, HO Desseyn, L Datas, V Barrón and A Rousset (2001) PHYSICS AND CHEMISTRY OF MINERALS. 28(7). p.488-497
abstract
A study of the characteristics of the Morin transition in aluminous hematites, alpha-(Fe1-xAlx)(2)O-3, produced from thermally transformed lepidocrocites, is reported. Six compositions with Al contents between 0.2 and 10 at% have been considered. It is argued that these samples present the advantage that they contain smaller amounts of hydroxyl and water as compared to hematites obtained by other preparation methods. The samples were characterised by a variety of conventional techniques, including thermal analyses, X-ray diffraction, FTIR, TEM/EDX, BET surface-area measurements and diffuse reflectance spectroscopy. All results indicate that the Al is structurally incorporated in the hematite lattices. Transmission Mossbauer spectra were recorded at various temperatures between 80 K and room temperature in order to precisely determine the Morin-transition region and the spin structure in both the low-temperature antiferromagnetic and weakly ferromagnetic states. It was found that the Morin-transition temperatures are markedly higher as compared to similar hematites made from aluminous goethites and that a transition phenomenon persists to an Al substitution of up to at least 10 at%. This different behaviour is ascribed to lower concentrations of structural hydroxyl groups in these lepidocrocite-based hematites.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
characterisation, hematite, Morin transition, Mossbauer spectroscopy, IRON-OXIDES, MORIN TRANSITION, MOSSBAUER, ALUMINUM, COLOR, TRANSFORMATION, SPECTROSCOPY, LIMITATIONS, PARAMETERS, CRYSTALS
journal title
PHYSICS AND CHEMISTRY OF MINERALS
Phys. Chem. Miner.
volume
28
issue
7
pages
488 - 497
Web of Science type
Article
Web of Science id
000170598800006
JCR category
MATERIALS SCIENCE, MULTIDISCIPLINARY
JCR impact factor
1.762 (2001)
JCR rank
15/167 (2001)
JCR quartile
1 (2001)
ISSN
0342-1791
DOI
10.1007/s002690100169
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
169491
handle
http://hdl.handle.net/1854/LU-169491
date created
2004-01-14 13:40:00
date last changed
2016-12-19 15:37:57
@article{169491,
  abstract     = {A study of the characteristics of the Morin transition in aluminous hematites, alpha-(Fe1-xAlx)(2)O-3, produced from thermally transformed lepidocrocites, is reported. Six compositions with Al contents between 0.2 and 10 at\% have been considered. It is argued that these samples present the advantage that they contain smaller amounts of hydroxyl and water as compared to hematites obtained by other preparation methods. The samples were characterised by a variety of conventional techniques, including thermal analyses, X-ray diffraction, FTIR, TEM/EDX, BET surface-area measurements and diffuse reflectance spectroscopy. All results indicate that the Al is structurally incorporated in the hematite lattices. Transmission Mossbauer spectra were recorded at various temperatures between 80 K and room temperature in order to precisely determine the Morin-transition region and the spin structure in both the low-temperature antiferromagnetic and weakly ferromagnetic states. It was found that the Morin-transition temperatures are markedly higher as compared to similar hematites made from aluminous goethites and that a transition phenomenon persists to an Al substitution of up to at least 10 at\%. This different behaviour is ascribed to lower concentrations of structural hydroxyl groups in these lepidocrocite-based hematites.},
  author       = {Van San, Erwin and De Grave, Eddy and Vandenberghe, Robert and Desseyn, HO and Datas, L and Barr{\'o}n, V and Rousset, A},
  issn         = {0342-1791},
  journal      = {PHYSICS AND CHEMISTRY OF MINERALS},
  keyword      = {characterisation,hematite,Morin transition,Mossbauer spectroscopy,IRON-OXIDES,MORIN TRANSITION,MOSSBAUER,ALUMINUM,COLOR,TRANSFORMATION,SPECTROSCOPY,LIMITATIONS,PARAMETERS,CRYSTALS},
  language     = {eng},
  number       = {7},
  pages        = {488--497},
  title        = {Study of Al-substituted hematites, prepared from thermal treatment of lepidocrocite},
  url          = {http://dx.doi.org/10.1007/s002690100169},
  volume       = {28},
  year         = {2001},
}

Chicago
Van San, Erwin, Eddy De Grave, Robert Vandenberghe, HO Desseyn, L Datas, V Barrón, and A Rousset. 2001. “Study of Al-substituted Hematites, Prepared from Thermal Treatment of Lepidocrocite.” Physics and Chemistry of Minerals 28 (7): 488–497.
APA
Van San, E., De Grave, E., Vandenberghe, R., Desseyn, H., Datas, L., Barrón, V., & Rousset, A. (2001). Study of Al-substituted hematites, prepared from thermal treatment of lepidocrocite. PHYSICS AND CHEMISTRY OF MINERALS, 28(7), 488–497.
Vancouver
1.
Van San E, De Grave E, Vandenberghe R, Desseyn H, Datas L, Barrón V, et al. Study of Al-substituted hematites, prepared from thermal treatment of lepidocrocite. PHYSICS AND CHEMISTRY OF MINERALS. 2001;28(7):488–97.
MLA
Van San, Erwin, Eddy De Grave, Robert Vandenberghe, et al. “Study of Al-substituted Hematites, Prepared from Thermal Treatment of Lepidocrocite.” PHYSICS AND CHEMISTRY OF MINERALS 28.7 (2001): 488–497. Print.