Title :
Surfactant assisted ball-milling of barium ferrite
Author :
Campbell, S.J. ; Kaczmarek, W.A. ; Wu, E. ; Jayasuriya, K.D.
Author_Institution :
Dept. of Phys., New South Wales Univ., Kensington, NSW, Australia
fDate :
3/1/1994 12:00:00 AM
Abstract :
The effects of wet-milling barium ferrite in the presence of cationic or anionic surface active substances have been investigated by X-ray diffraction and Mossbauer spectroscopy measurements. Evidence for superparamagnetic relaxation of fine particles, both in the surfactant assisted ball-milled samples and in samples dry-milled in air is obtained from the room temperature and 4.2 K Mossbauer spectra. The similarity between samples milled at pH 3 with the cationic or anionic surfactants is due to electrostatic interactions of the surfactants´ hydrocarbon groups with the positively charged barium ferrite surface
Keywords :
Mossbauer effect; X-ray diffraction examination of materials; barium compounds; ferrites; magnetic properties of fine particles; powder technology; superparamagnetism; surface chemistry; 4.2 K; BaFe12O19; Mossbauer spectroscopy; X-ray diffraction; anionic surfactants; ball-milling; barium ferrite; cationic surfactants; electrostatic interactions; fine particles; superparamagnetic relaxation; wet-milling; Barium; Ferrites; Force measurement; Magnetic materials; Magnetic properties; Milling; Powders; Saturation magnetization; Surface morphology; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
