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Preparation of Y‐type Barium Hexaferrite by the Glass–Ceramic Method
Author(s) -
Nagae Masahiro,
Atsumi Takashi,
Yoshio Tetsuo
Publication year - 2006
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.1551-2916.2005.00825.x
Subject(s) - materials science , barium , ceramic , phase (matter) , analytical chemistry (journal) , leaching (pedology) , mineralogy , precipitation , composite material , metallurgy , chemistry , environmental science , physics , organic chemistry , chromatography , meteorology , soil science , soil water
Y‐type Ba‐hexaferrites (Ba 2 Zn 2 Fe 12 O 22 ), which have been identified as electromagnetic wave absorbers, were prepared by the glass–ceramic method. Glasses with the composition 0.1ZnO·0.9( x B 2 O 3 · y BaO·(1− x − y )Fe 2 O 3 ) were prepared, and the precipitation of Y‐type Ba‐hexaferrite from the glass matrix was investigated. Y‐type Ba‐hexaferrite were precipitated by heating glass specimens with roughly the composition 0.1ZnO·0.9(0.2B 2 O 3 ·0.5BaO·0.3Fe 2 O 3 ) at temperatures above about 1073 K. The lower temperature limit at which single‐phase Y‐type powder was obtained after leaching with a dilute HCl solution was about 1093 K. The low‐temperature formation of Y‐type Ba‐hexaferrite was linked to the generation of a liquid phase. The shape of Y‐type crystals depended strongly on the heating temperature and changed from a plate‐like hexagon to a complex polyhedron with increasing heating temperature.