UNSPECIFIED (2001) Magnetic properties of nanocrystalline CoFe2O4 powders prepared at room temperature: Variation with crystallite size. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 232 (1-2). pp. 71-83. ISSN 0304-8853

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Abstract

The magnetic properties of nanocrystalline CoFe2O4 powders prepared by a redox process at room temperature have been studied by vibrating sample magnetometer (VSM). The average crystallite size of the powders varied from 6 to 20 nm by changing the synthesis conditions and the corresponding saturation magnetisation (M,) value ranged from 9 to 38 emu g(-1). On heating, the crystallite size increased with corresponding increase in M-s values. At 1073 K all samples achieved M-s values close to 73 emu g(-1). On increasing the crystallite size, the coercivity (H-c) increased passed through a maximum and dropped. Cobalt ferrite powder with an average crystallite size of 6 nm prepared at room temperature achieved desirable values of M-s = 60 emu g(-1) and H-c = 1.42 kOe after thermal annealing at 973 K. The Mossbauer spectra were recorded for CoFe2O4 having a range of crystallite sizes at room temperature and at low temperatures down to 40K. The magnetic and Mossbauer results are provided for nanocrystalline CoFe2O4 as a function of crystallite size and measurement temperature. (C) 2001 Elsevier Science B.V. All rights reserved.

Item Type:	Journal Article
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:	June 2001
Volume:	232
Number:	1-2
Number of Pages:	13
Page Range:	pp. 71-83
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/12036

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