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Spray Pyrolysis of Fe 3 O 4 –BaTiO 3 Composite Particles
Author(s) -
Adachi Tomoyuki,
Wakiya Naoki,
Sakamoto Naonori,
Sakurai Osamu,
Shinozaki Kazuo,
Suzuki Hisao
Publication year - 2009
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/j.1551-2916.2008.02655.x
Subject(s) - materials science , composite number , nanocrystalline material , nanocomposite , scanning electron microscope , particle (ecology) , chemical engineering , coercivity , transmission electron microscopy , pyrolysis , particle size , composite material , analytical chemistry (journal) , nanotechnology , chemistry , organic chemistry , oceanography , physics , condensed matter physics , engineering , geology
Fe 3 O 4 –BaTiO 3 composite particles were successfully prepared by ultrasonic spray pyrolysis. A mixture of iron(III) nitrate, barium acetate and titanium tetrachloride aqueous solution were atomized into the mist, and the mist was dried and pyrolyzed in N 2 (90%) and H 2 (10%) atmosphere. Fe 3 O 4 –BaTiO 3 composite particle was obtained between 900° and 950°C while the coexistence of FeO was detected at 1000°C. Transmission electron microscope observation revealed that the composite particle is consisted of nanocrystalline having primary particle size of 35 nm. Lattice parameter of the Fe 3 O 4 –BaTiO 3 nanocomposite particle was 0.8404 nm that is larger than that of pure Fe 3 O 4 . Coercivity of the nanocomposite particle (390 Oe) was much larger than that of pure Fe 3 O 4 (140 Oe). These results suggest that slight diffusion of Ba into Fe 3 O 4 occurred.