UNSPECIFIED (1997) An X-ray diffraction and Mossbauer study of nanocrystalline Fe2O3-Cr2O3 solid solutions. JOURNAL OF MATERIALS SCIENCE, 32 (3). pp. 557-560. ISSN 0022-2461

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Abstract

A series of gels with nominal composition Fe2-xCrxO3 (x = 0-2) was prepared at room temperature by an inorganic sol-gel route and studied by X-ray diffraction and Mossbauer spectroscopy. The gels dried at 105 degrees C were found to be X-ray amorphous, but Mossbauer studies revealed the gels to be nano-crystalline solid-solution particles of the composition above, with super-paramagnetic properties. Further heating to 600 degrees C gave crystalline X-ray patterns which allowed lattice parameter and crystallite size calculations to be made. It was found that lattice parameters and crystallite sizes decreased with increasing chromia content, and that at the higher chromia/iron ratios, a partially collapsed Mossbauer pattern results, indicating reductions in crystallite size and hyperfine field with increasing chromia content.

Item Type:	Journal Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Journal or Publication Title:	JOURNAL OF MATERIALS SCIENCE
Publisher:	CHAPMAN HALL LTD
ISSN:	0022-2461
Date:	1 February 1997
Volume:	32
Number:	3
Number of Pages:	4
Page Range:	pp. 557-560
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/18020

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