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Preparation of Oriented Barium Hexaferrite Films by Electrophoretic Deposition
Author(s) -
Ovtar Simona,
Lisjak Darja,
Drofenik Miha
Publication year - 2011
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.1551-2916.2011.04500.x
Subject(s) - electrophoretic deposition , materials science , dodecylbenzene , zeta potential , adsorption , barium , scanning electron microscope , analytical chemistry (journal) , deposition (geology) , electrophoresis , chemical engineering , chemistry , composite material , nanotechnology , chromatography , nanoparticle , sulfonate , coating , paleontology , sediment , biology , engineering , metallurgy , sodium
Stable, hard‐magnetic suspensions were prepared from barium hexaferrite (BaHF) particles. The particles were stabilized in 1‐butanol with the adsorption of dodecylbenzene sulphonic acid onto the particles' surfaces. This adsorption was observed in the FTIR spectra and resulted in a high zeta‐potential of 110 mV. The stable suspensions were then used for electrophoretic deposition. The magnetically oriented films with a thickness of 15 μm were prepared after sintering the deposits at different temperatures. The degree of orientation of the BaHF hexagonal plates in the films was examined with electron microscopy, X‐ray diffraction (XRD), and magnetic measurements. Large differences between in‐plane and out‐of‐plane magnetic properties of films were observed. The BaHF films exhibit a very high out‐of‐plane M r /M s ratio of 0.88, which confirms the high XRD degree of orientation of 94%.