Large zinc cation occupancy of octahedral sites in mechanically activated zinc ferrite powders
- Center for Electromagnetic Research, Northeastern University, Boston, Massachusetts 02115 (United States)
- Complex Materials Section, Code 6342, Naval Research Laboratory, Washington, DC 20375 (United States)
- Department of Physics, Wichita State University, Wichita, Kansas 67260 (United States)
The cation site occupancy of a mechanically activated nanocrystalline zinc ferrite powder was determined as (Zn{sub 0.55}{sup 2+}Fe{sub 0.18}{sup 3+}){sub tet}[Zr{sub 0.45}{sup 2+}Fe{sub 1.82}{sup 3+}]{sub oct}O{sub 4} through analysis of extended x-ray absorption fine structure measurements, showing a large redistribution of cations between sites compared to normal zinc ferrite samples. The overpopulation of cations in the octahedral sites was attributed to the ascendance in importance of the ionic radii over the crystal energy and bonding coordination in determining which interstitial sites are occupied in this structurally disordered powder. Slight changes are observed in the local atomic environment about the zinc cations, but not the iron cations, with respect to the spinel structure. The presence of Fe{sup 3+} on both sites is consistent with the measured room temperature magnetic properties. (c) 2000 American Institute of Physics.
- OSTI ID:
- 20216185
- Journal Information:
- Applied Physics Letters, Vol. 76, Issue 19; Other Information: PBD: 8 May 2000; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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