Title: Sintering Behavior, Microstructure, and Dielectric Properties of Nano-Ba(0.7)Sr(0.3)TiO(3) Ceramics
Authors: Ying, Kuo-Liang
Hsieh, Tsung-Eong
Department of Materials Science and Engineering
Issue Date: 1-Oct-2008
Abstract: Nanoscale Ba(0.7)Sr(0.3)TiO(3) (BST) powders were synthesized by solid-state reaction, chemical dispersion, and mechanical grinding. Capacitor samples based on the nano-BST powders were then prepared; their sintering behaviors at different temperatures, dielectric properties, and correlations to microstructure were investigated accordingly. It was found that specific sintering conditions are essential for achieving high-density (>= 95%) BST samples with a desired microstructure. Dielectric property measurements revealed that the best result was achieved in samples sintered at 1200 degrees C for 6h (dielectric constant = 9700; dielectric loss = 0.04) or at 1300 degrees C for 1 h (dielectric constant = 9800; dielectric loss = 0.075). The BST samples exhibited a lower Curie point (T(C)) than conventional BaTiO(3) (BTO) and BST systems. The improvement of dielectric properties and phase transition temperature were attributed to the fine grain structure in BST samples.
URI: http://dx.doi.org/10.1143/JJAP.47.7947
ISSN: 0021-4922
DOI: 10.1143/JJAP.47.7947
Volume: 47
Issue: 10
Begin Page: 7947
End Page: 7952
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