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Crystal Research and Technology |
Cryst. Res. Technol. 38,
927 (2003) - Abstract -
Synthesis and characterization of hexagonal ferrites BaFe12-2xZnxTixO19 (0 <= x <= 2) by thermal decomposition of freeze-dried precursors
S. Rösler, P. Wartewig*, H. Langbein
Institute of Inorganic Chemistry, Dresden University of Technology, Mommsenstraße 13, 01069 Dresden, Germany
*Institute of Experimental Physics, University Leipzig, Linnestraße 5, 04103 Leipzig, Germany
| Keywords | freeze drying, hexaferrite, thermal analysis, XRD, magnetic properties |
| PACS | 61.66 Fn, 75.50 Gg |
| DOI | 10.1002/crat.200310115 |
Substituted barium hexaferrites, BaFe12-2xZnxTixO19 (0 <= x <= 2), have been synthesized by thermal decomposition of freeze-dried acetate precursors. Decomposition and phase formation were investigated by means of thermal analysis, XRD and IR spectroscopy. The initially amorphous decomposed precursor reacts to the substituted hexaferrite via a spinel-like maghemite (γ-Fe2O3) and Zn/Ti containing spinel ferrites. The synthesis method allows a decrease of the reaction temperature and time, necessary for producing a single phase hexaferrite. At relative low reaction temperatures, the substitution rate x shows remarkable differences at different iron sublattices. For x <= 0,8 this selective substitution results in an increase of magnetization as x grows.
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