期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 25, 期 12, 页码 2453-2456出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2005.03.081
关键词
Bi-layered ferroelectrics; ferroelectric properties
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.
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