UNSPECIFIED (1997) Crystallite size dependence on the magnetic properties of nanocrystalline magnetite powders. [Journal Item]

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Abstract

Single phase magnetite powders with crystallite sizes ranging from 8-50 nm were synthesised and studied using X-ray diffraction and Mossbauer spectroscopy. Lattice parameters were seen to decrease at very small crystallite sizes. Quadrupole splitting of the B sites increased with decreasing crystallite size before the spectrum collapsed into a doublet at the smallest sizes. These observations have been explained in terms of high surface-to-volume ratios in the small nanocrystals creating excessive lattice strain and large electric field gradients. (C) 1997 Elsevier Science B.V. All rights reserved.

Item Type:	Journal Item
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) Q Science > QC Physics
Journal or Publication Title:	JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Publisher:	ELSEVIER SCIENCE BV
ISSN:	0304-8853
Date:	December 1997
Volume:	176
Number:	2-3
Number of Pages:	4
Page Range:	L89-L92
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/16087

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