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In Situ Formation of Hexaferrite Magnets within a 3Y‐TZP Matrix: La 2 O 3 –ZnO–Fe 2 O 3 and BaO–Fe 2 O 3 Systems
Author(s) -
Suzuki Yoshikazu,
Calderón Héctor A.,
Kondo Naoki,
Ohji Tatsuki
Publication year - 2000
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.1151-2916.2000.tb01391.x
Subject(s) - materials science , lanthanum , tetragonal crystal system , barium , in situ , lanthanum oxide , oxide , composite number , crystallography , mineralogy , analytical chemistry (journal) , composite material , crystal structure , metallurgy , chemistry , inorganic chemistry , chromatography , organic chemistry
The in situ formation of magnetoplumbite‐type (M‐type) hexaferrites within a 3Y‐TZP matrix was examined for the La 2 O 3 –ZnO–Fe 2 O 3 and BaO–Fe 2 O 3 systems. The formation of barium hexaferrite (Ba‐M) was rapid enough at a temperature of 1300°C for 2 h to result in a uniform dispersion of fine Ba‐M particles in a tetragonal zirconia polycrystal (TZP) matrix. However, the formation of lanthanum‐substituted hexaferrite (La‐M) was rather sluggish, despite the existence of a charge‐compensating divalent oxide. The 3Y‐TZP/20‐wt%‐BaFe 12 O 19 in situ composite possessed good magnetic properties, as well as moderately good mechanical properties.