J. Phys. IV France 07 (1997) C1-83-C1-84
XRD and HREM Studies of Structural Phases in Non-Stoichiometric Complex Iron OxidesW.A. Kaczmarek1 and M. Giersig2
1 Research School of Physical Sciences and Engineering, Australian National University, Canberra, A.C.T. 0200, Australia
2 Advanced Mineral Products Research Centre, University of Melborne, Parkville, VIC 3052, and Hahn-Meitner-Institut, Abt. Kleinteilchenforschung, 14109 Berlin, Germany
The influence of prolonged ball milling on structural changes of hexagonal and spinel type complex iron oxides has been studied by x-ray diffraction and high resolution electron microscopy. The XRD and HREM results for ball milled SrFe12O19 ferrite show fast decomposition and formation of Fe2O3 and SrO simple oxides. Microstructural developments for a powder mixture of Co(OH)2 and Fe2O3 show the formation of cubic type structure (spinel). By comparison with the XRD results, HREM analysis confirmed local phase separation, with magnetic Fe3O4 and CoFe2O4 nanosize (10-30 nm) particles being formed.
© EDP Sciences 1997