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Synthesis and characterization of hexagonal ferrites BaFe 12‐2x Zn x Ti x O 19 (0 ≤ x ≤ 2) by thermal decomposition of freeze‐dried precursors
Author(s) -
Rösler S.,
Wartewig P.,
Langbein H.
Publication year - 2003
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200310115
Subject(s) - thermal decomposition , spinel , decomposition , maghemite , amorphous solid , magnetization , barium , materials science , phase (matter) , analytical chemistry (journal) , chemistry , crystallography , nuclear chemistry , inorganic chemistry , mineralogy , metallurgy , organic chemistry , hematite , physics , quantum mechanics , magnetic field
Substituted barium hexaferrites, BaFe 12‐2x Zn x Ti x O 19 (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‐Fe 2 O 3 ) 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)