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Enhanced Coercivity of CaLaCo‐Doped SrM Hexaferrites by Microwave‐Calcination Technique
Author(s) -
Chen Zhongyan,
Wang Fan,
Yan Shuoqing,
Nie Yan,
Feng Zekun,
Chen Yajie,
Harris Vincent G.
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12862
Subject(s) - coercivity , calcination , materials science , microstructure , muffle furnace , grain size , scanning electron microscope , microwave , ferrite (magnet) , analytical chemistry (journal) , ceramic , magnetization , mineralogy , metallurgy , composite material , chemistry , magnetic field , condensed matter physics , biochemistry , physics , quantum mechanics , chromatography , catalysis
The effects of microwave calcination (MC) and conventional muffle furnace calcination (CC) on the microstructure and magnetic properties of M‐type hexagonal ferrite Ca 0.15 La 0.39 Sr 0.46 Fe 11.7 Co 0.3 O 19 were investigated. The phase composition, microstructure, and magnetic properties of calcined materials were examined using X‐ray diffraction (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometry. Experiments indicated that the MC method can achieve both pure phase, and fine and uniform grains for both calcined and sintered M‐type hexaferrites. MC treatments resulted in a magnetization at 15 kO e of 67 emu/g and an increase in coercivity by 12% over the CC technique. The improved magnetic properties resulting from microwave‐assisted calcination were attributed to the formation of a fine‐grained morphology, which yielded a narrow grain size distribution. The microwave calcinating technique was shown here to possess unique potential for fabrication of high‐performance ferrites and possibly other ceramics.