期刊
CERAMICS INTERNATIONAL
卷 39, 期 7, 页码 8147-8152出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2013.03.088
关键词
Dielectric properties; Bismuth sodium titanate; Ceramic; Solution combustion
资金
- National Natural Science Foundation of China [51002054]
- Fundamental Research Funds for the Central Universities
- HUST [2011TS014]
Pure Bi0.5Na0.5TiO3 powders have been successfully synthesized by a single-step solution combustion technology using urea as fuel and metal (Bi and Na) nitrates as reactants. The phase structure and morphology of the as-prepared product were examined by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). Effects of reaction parameters including fuel to oxidizers ratio and ignition temperature on the phase formation and morphology evolution were investigated. XRD shows that a single perovskite BNT phase is formed at the ignition temperature of 600 degrees C with fuel to oxidizers ratio of 2.0. Well-dispersed powders with the average particle size of 200 nm are obtained after milling for 24 h. BNT ceramics can be well densified at 1140 degrees C for 2 h with average grain size about 2 mu m and show evidence of relaxor ferroelectric behaviors with diffuse phase transition and frequency dispersion. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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