Title :
Magnetic properties of Cr3+ substituted BaFe12O19 powders grown by a sol-gel method
Author :
Kim, Chul Sung ; An, Sung Yong ; Son, Ji Hee ; Lee, Jae-Gwang ; Oak, Hang Nam
Author_Institution :
Dept. of Phys., Kookmin Univ., Seoul, South Korea
fDate :
9/1/1999 12:00:00 AM
Abstract :
Cr3+ substituted Ba-hexaferrite was fabricated by a sol-gel method. The crystallographic and magnetic properties of BaFe12-xCrxO19 (0⩽x⩽7) were investigated XRD, Rutherford backscattering spectrometry, vibrating sample magnetometry and Mossbauer spectroscopy. The crystal structure was found to be magnetoplumbite, typical of M-type hexagonal ferrite. By substituting Fe3+ in BaFe12O19 by Cr 3+, we have been able to attribute the Mossbauer parameters to the 5 crystallographic sites of the structure. Only the octahedral sublattices were occupied by Cr ions. The isomer shifts indicate that the valence state of the Fe ions was Fe3+. The Curie temperatures of BaFe12-xCrxO19 decreased linearly increasing Cr-substitution, at a rate of 55 K/Cr atom
Keywords :
Mossbauer effect; Rutherford backscattering; barium compounds; chromium; ferrites; magnetic particles; powders; sol-gel processing; valence bands; Ba(FeCr)12O19; BaFe12-xCrxO19; BaFe12O19:Cr; Cr3+ substituted BaFe12O19 powders; M-type hexagonal ferrite; Mossbauer spectroscopy; Rutherford backscattering spectrometry; XRD; crystal structure; magnetic properties; magnetoplumbite; octahedral sublattices; sol-gel method; valence state; vibrating sample magnetometry; Chromium; Crystallography; Ferrites; Magnetic properties; Physics; Powders; Scanning electron microscopy; Spectroscopy; Temperature; X-ray scattering;
Journal_Title :
Magnetics, IEEE Transactions on
