Fabrication of Textured Bi₃NbTiO₉ Ceramics

Abstract

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 (B1 lm) 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 10001C, which is about 1001C 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 B0.91) ceramic with a relative density of B92% is obtained at 11501C. Because of the oriented grain microstructure, textured Bi 3 NbTiO 9 ceramic exhibits anisotropic electrical properties. J ournal

Doping level effects in Nb self‐doped Bi3TiNbO9 high‐temperature piezoceramics with improved electrical properties

“…To uncover the underlying mechanism for the large doping level effect of resistivity, complex impedance plots of NBT‐0 and NBT‐0.04 ceramics at the temperature range from 400‐600°C are given in Figure 8. As can be seen, two semicircles can be observed at every measured temperature for the pristine NBT sample, which is consistent with the previous report 10 . The left semicircle can be attributed to the contribution of grains, and the right semicircle is contributed by grain boundary effect 36 .…”

“…Bismuth titanate niobate (Bi 3 TiNbO 9 , NBT), a member belonging to the BLSFs, possessing a very high T C (~913°C), is deemed as one of the rare candidates that can be utilized at temperatures above 600°C. However, similar to other BLSFs ceramics, the pristine NBT exhibits a very low d 33 (<7 pC/N) and relatively low resistivity (6.90 × 10 4 Ω·cm at 600°C) 9,10 . Great efforts need to be paid to realize its practical application.…”

Investigation of Phase Structure and Electrical Properties of Doped PMN–PZT Ceramics Prepared by Different Methods

“…According to above analyzed results, crystallites in S1 are partially oriented with the c ‐axis while that of S2 are randomly oriented. The crystalline orientation in S1 may lead to higher dielectric constant, which was also found in other materials, such as BNT ceramics …”

“…The crystalline orientation in S1 may lead to higher dielectric constant, which was also found in other materials, such as BNT ceramics. 18 (3) Piezoelectric Properties The piezoelectric coefficient d 33 , electromechanical coupling factor k p , and electromechanical quality factor Q m of the two samples as function of poling temperature are shown in Fig. 4.…”

Plate‐Like Na0.5Bi0.5TiO3 Template Synthesized by a Topochemical Method

“…2). This suggests that this type of particles (large and plate‐like) can be directly used to fabricate highly grain‐oriented ceramics by uniaxial press instead of tape casting or hot forge 15 …”