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Fabrication of Textured Bi 3 NbTiO 9 Ceramics
Author(s) -
Xiang PingHua,
Kinemuchi Yoshiaki,
Watari Koji,
Cao Fei,
Dong XianLin
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.1551-2916.2005.00723.x
Subject(s) - materials science , sintering , crystallite , ceramic , microstructure , equiaxed crystals , texture (cosmology) , fabrication , composite material , relative density , grain size , calcination , mineralogy , metallurgy , medicine , biochemistry , image (mathematics) , alternative medicine , chemistry , pathology , artificial intelligence , computer science , catalysis
Highly textured Bi 3 NbTiO 9 ceramics are fabricated by normal sintering from molten salt‐synthesized plate‐like crystallites. Fine Bi 3 NbTiO 9 plate‐like crystallites (∼1 μm) not only facilitate the densification, but also enhance texture in Bi 3 NbTiO 9 ceramics. Weak‐agglomerated platelets exhibit higher sinterability and can be densified at a temperature as low as 1000°C, which is about 100°C lower than that of equiaxed powders prepared by directly calcining Bi 3 NbTiO 9 precursor. Meanwhile, the orientation degree of textured Bi 3 NbTiO 9 ceramics increases with sintering temperature. Highly oriented Bi 3 NbTiO 9 (orientation degree of ∼0.91) ceramic with a relative density of ∼92% is obtained at 1150°C. Because of the oriented grain microstructure, textured Bi 3 NbTiO 9 ceramic exhibits anisotropic electrical properties.