Microstructure and Magnetic Property of M-Type SrRExFe12−xO19 by Sol–Gel Method

Authors: Li, Cong-Ju; Wang, Jiao-Na; Li, Xiu-Yan; Gong, Jian Ru

Source: Journal of Nanoscience and Nanotechnology, Volume 11, Number 5, May 2011 , pp. 3894-3898(5)

Publisher: American Scientific Publishers

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Abstract:

Magnetoplumbite-type (M-type) SrRExFe12−xO19 (RE = La and Ce, x = 0∼1.0) powders were prepared by a citric acid sol–gel technique and subsequent heat treatment. The crystal structure, grain size and magnetic properties were investigated by X-ray Diffraction (XRD), Scanning Electron Microscope (SEM) and vibrating sample magnetometer (VSM). The XRD patterns show that SrRExFe12−xO19 (RE = La and Ce) are mainly hexagonal magnetic plumbite structure, and the average grain size of 30∼40 nm was calculated using the Scherer's equation based on the XRD spectrum. Substitution of Fe ion by the rare earth La ion causes a significant decrease in intrinsic coercivity (Hc) and a slight decrease in saturation magnetization (Ms) as shown in the magnetization hysteresis loops. However, the Hc rises gradually in a small wave pattern with the increase of doping content of the rare earth Ce. The relation between the crystal structure and magnetic properties was also studied in this work.

Keywords: FERRITES; MAGNETIC MATERIALS/PROPERTIES; PARTICLES; RARE EARTHS; SOL-GEL

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2011.3846

Publication date: May 1, 2011

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