Title :
Thermomagnetic study of surface cobalt modified iron oxide particles derived from oxalic precursors
Author :
Gougeon, M. ; Leroy, E. ; Tailhades, Ph. ; Mollard, P. ; Rousset, A.
Author_Institution :
Univ. Paul Sabatier, Toulouse, France
fDate :
1/1/1990 12:00:00 AM
Abstract :
The cobalt modification of pure γ-Fe2O3 acicular particles by the so-called epitaxial process has been applied to γ-Fe2O3 particles, derived from oxalic precursors. Six elaboration parameters have been taken into account for the slurry heat treatment: cable content, pH, time, temperature, gas flowing into the solution, and surface activation. A thermomagnetic study including in situ annealing treatments and magnetic measurements at various temperatures in the range 20-380°C has been carried out. The results are compared with those of commercial surface-cobalt-modified pigments
Keywords :
cobalt; ferrites; heat treatment; iron compounds; magnetic annealing; magnetic properties of fine particles; magnetic recording; powder technology; surface treatment; 20 to 380 C; acicular particles; cable content; epitaxial process; gamma Fe2O3:Co particles; in situ annealing; magnetic particles; oxalic precursors; pH; slurry heat treatment; surface activation; surface modified particles; temperature dependence; thermomagnetic study; time dependence; Annealing; Cobalt; Heat treatment; Iron; Magnetic variables measurement; Pigments; Slurries; Surface treatment; Temperature distribution; Temperature measurement;
Journal_Title :
Magnetics, IEEE Transactions on
