화학공학소재연구정보센터
Journal of the American Ceramic Society, Vol.89, No.2, 684-687, 2006
Fabrication of textured Bi3NbTiO9 ceramics
Highly textured Bi3NbTiO9 ceramics are fabricated by normal sintering from molten salt-synthesized plate-like crystallites. Fine Bi3NbTiO9 plate-like crystallites (similar to 1 mu m) not only facilitate the densification, but also enhance texture in Bi3NbTiO9 ceramics. Weak-agglomerated platelets exhibit higher sinterability and can be densified at a temperature as low as 1000 degrees C, which is about 100 degrees C lower than that of equiaxed powders prepared by directly calcining Bi3NbTiO9 precursor. Meanwhile, the orientation degree of textured Bi3NbTiO9 ceramics increases with sintering temperature. Highly oriented Bi3NbTiO9 (orientation degree of similar to 0.91) ceramic with a relative density of similar to 92% is obtained at 1150 degrees C. Because of the oriented grain microstructure, textured Bi3NbTiO9 ceramic exhibits anisotropic electrical properties.