Sintering Behavior, Microstructure, and Dielectric Properties of Nano-Ba0.7Sr0.3TiO3 Ceramics
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概要
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Nanoscale Ba0.7Sr0.3TiO3 (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 (${\geq}95$%) BST samples with a desired microstructure. Dielectric property measurements revealed that the best result was achieved in samples sintered at 1200 °C for 6 h (dielectric constant = 9700; dielectric loss = 0.04) or at 1300 °C for 1 h (dielectric constant = 9800; dielectric loss = 0.075). The BST samples exhibited a lower Curie point ($T_{\text{C}}$) than conventional BaTiO3 (BTO) and BST systems. The improvement of dielectric properties and phase transition temperature were attributed to the fine grain structure in BST samples.
- 2008-10-25
著者
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Hsieh Tsung-eong
Department Of Materials Science And Engineering National Chiao Tung University
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Ying Kuo-Liang
Department of Materials Science and Engineering, National Chiao Tung University, 1001 Ta-Hsueh Road, Hsinchu, Taiwan 30049, R.O.C.
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Hsieh Tsung-Eong
Department of Materials Science and Engineering, National Chiao Tung University, 1001 Ta-Hsueh Road, Hsinchu, Taiwan 30049, R.O.C.
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Hsieh Tsung-Eong
Department of Material Science and Engineering, National Chiao Tung University, Hsinchu 300, Taiwan
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