期刊
MATERIALS RESEARCH BULLETIN
卷 48, 期 6, 页码 2220-2226出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2013.02.044
关键词
Electronic materials; Nanostructures; Sol-gel chemistry; Impedance spectroscopy; Electrical properties
资金
- National Key Technology Support Program [2009BAG12A07]
- Zhejiang Province Innovation Group Program [2011R09010]
Sc-doped barium titanate (BaTiO3) nanopowders and ceramics were prepared by a sol-gel method for the first time. The polymorphism, microstructure and dielectric properties were investigated. Pseudo-cubic Sc-doped BaTiO3 nanopowders with a particle size of 30-40 nm have been achieved at low temperature of 800 degrees C. A phase diagram for the solid solution system BaTi1-xScxO3-delta was obtained. The limit of pseudo-cubic Sc-doped BaTiO3 solid solution (BTss) and the stable hexagonal phase have a large dependence on temperatures. The dopant of Sc3+ can also dramatically refine the grain size of BaTiO3 to 300 nm when x = 0.10. For different Sc3+ content in BaTiO3 ceramics, two types of impedance response appeared, and the resistivity of ceramics was dominated by bulk resistance or grain boundary resistance. Curie temperature (T-C) and dielectric constant decreased by increasing the Sc3+ content. Relaxor behaviour occurs below room temperature when x = 0.10. (C) 2013 Elsevier Ltd. All rights reserved.
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