Title :
A Mossbauer study of CoMo-substituted barium ferrite
Author :
Agresti, D.G. ; Shelfer, T.D. ; Hong, Y.K. ; Paig, Y.J.
Author_Institution :
Dept. of Phys., Alabama Univ., Birmingham, AL, USA
fDate :
9/1/1989 12:00:00 AM
Abstract :
Well-resolved Mossbauer spectra were obtained for CoMo-doped barium ferrite with variable doping (0-33% Fe), heat-treatment temperature (825-1200°C), and sample temperature (90-300 K). Substitution was observed to occur primarily on the 12-K site, with little or no lattice distortion. A fitting model using five independent components, each a sextet, yielded the magnetic hyperfine field (ionic moment) of each site as a function of doping and sample temperature. A 10% reduction of the moment on the 2a site was observed upon doping, which results from its proximity to the 12-K site. Other sextet parameters were generally constant or followed monotonic trends
Keywords :
Mossbauer effect; barium compounds; cobalt compounds; crystal hyperfine field interactions; ferrites; molybdenum compounds; 825 to 1200 degC; 90 to 300 K; BaCoxMoxFe12-2xO19; Mossbauer spectra; doping; ferrite; fitting model; heat-treatment temperature; ionic moment; lattice distortion; magnetic hyperfine field; sample temperature; sextet parameters; Barium; Contamination; Crystallography; Doping; Ferrites; Iron; Lattices; Paramagnetic materials; Temperature distribution; X-ray scattering;
Journal_Title :
Magnetics, IEEE Transactions on
