Synthesis and characterization of hexagonal ferrites BaFe12-2xZnxTixO19 (0 x 2) by thermal decomposition of freeze-dried precursors

Synthesis and characterization of hexagonal ferrites BaFe12-2xZnxTixO19 (0 x 2) by thermal decomposition of freeze-dried precursors
Published Online: 2 Oct 2003
Received: 15 April 2003; Accepted: 16 May 2003
Crystal Research and Technology
Volume 38, Issue 11 , Pages 927 - 934
Wiley InterScience
1Institute of Inorganic Chemistry, Dresden University of Technology, Mommsenstra?e 13, 01069 Dresden, Germany
2Institute of Experimental Physics, University Leipzig, Linnestra?e 5, 04103 Leipzig, Germany

email: H. Langbein (Hubert.Langbein@chemie.tu-dresden.de)
*Correspondence to H. Langbein, 1Institute of Inorganic Chemistry, Dresden University of Technology, Mommsenstra?e 13, 01069 Dresden, Germany
Keywords
freeze drying ? hexaferrite ? thermal analysis ? XRD ? magnetic properties
Abstract
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 (-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. (? 2003 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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