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Crystallographic Orientation Analysis on Calcium Cobaltite Ceramic Grains Textured by Reactive‐Templated Grain Growth
Author(s) -
Tani Toshihiko,
Itahara Hiroshi,
Kadoura Hiroaki,
Asahi Ryoji
Publication year - 2007
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2007.02146.x
Subject(s) - materials science , cobaltite , misorientation , electron backscatter diffraction , crystallite , crystallography , ceramic , nucleation , grain boundary , monoclinic crystal system , mineralogy , composite material , crystal structure , microstructure , metallurgy , chemistry , organic chemistry
Textured thermoelectric [Ca 2 CoO 3 ] 0.62 [CoO 2 ] (denoted as CCO) ceramic was fabricated and distributions of crystallographic orientations for local grains and misorientation angles between grains were investigated by electron backscatter diffraction pattern analysis. Most of the grains are preferentially aligned with their conductive ab ‐planes parallel to the original tape‐casting surface. Parallel aligned boundaries are observed in a single grain and the nearest neighboring crystallites sharing these boundaries have misorientation angles of multiples of 60°. It is suggested that these unique domain structures are formed during the topotactic nucleation and growth of monoclinic CCO phase on its precursor Ca x CoO 2 in a hexagonal crystal system.