Texture development and dielectric properties of SrBi2Ta2O9 ceramics processed by templated grain growth

authors	Amorin, H; Kholkin, AL; Costa, MEV
nationality	International
journal	JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
author keywords	Bi-layered ferroelectrics; ferroelectric properties
keywords	ELECTROMECHANICAL PROPERTIES; PIEZOELECTRIC PROPERTIES; FERROELECTRIC CERAMICS; ELECTRICAL-PROPERTIES; BISMUTH TITANATE; KINETICS
abstract	SrBi2Ta2O9 (SBT) textured ceramics were produced by templated grain growth (TGG) using anisometric templates grown by self-flux solution method. SBT templates (5 wt.%) with the dimensions similar to 40 mu m x 40 mu m x 8 mu m were embedded in a fine-grained matrix of SBT powder containing a 3 wt.% of Bi2O3 excess and partially aligned by conventional uniaxial pressing. Textured SBT ceramics characterized by a Lotgering factor f approximate to 0.4 could then be obtained after sintering at 1250 degrees C for 2 h. The influence of the pressing and sintering conditions on texture development was evaluated using scanning electron microscopy (SEM) and X-ray diffraction analysis (XRD). Significant improvement of the dielectric and ferroelectric properties was observed when measurements are performed perpendicularly to the pressing direction. This improvement was attested to the apparent alignment of the templates, dielectric anisotropy of SBT and texturing effect due to TGG. (c) 2005 Elsevier Ltd. All rights reserved.
publisher	ELSEVIER SCI LTD
issn	0955-2219
year published	2005
volume	25
issue	12
beginning page	2453
ending page	2456
digital object identifier (doi)	10.1016/j.jeurceramsoc.2005.03.081
web of science category	Materials Science, Ceramics
subject category	Materials Science
unique article identifier	WOS:000230569300100