Preparation and Electrical Properties of Sr2NaNb5O15—xLiSbO3 Lead-Free CeramicsReport as inadecuate




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Sr2NaNb5O15—xLiSbO3 lead-free ceramics were prepared by conventional solid state method. The phase structure, microstructure, dielectric and ferroelectric properties of obtained ceramics with different LiSbO3 content were investigated X-ray diffraction patterns showed that pure tungsten bronze structure can be obtained for all samples. The density of Sr2NaNb5O15—xLiSbO3 ceramics increased initially, obtained the maximum of 4.9597g-cm3 at x = 0.04 and then decreased. It was also found that ? r, ? m, Pr, and Ec all increased at first and then decreased with increasing x. The optimized electrical properties were obtained at x = 0.04: ? r=1492,? m=2062,Pr=6.84μC-cm2,Ec=17.86 kV-cm,Tc=241, indicating that the ceramics with x = 0.04 are promising materials.

KEYWORDS

ceramics; phase structure; dielectric properties; ferroelectric properties

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Author: Zhao-hu Li, Zu-pei Yang

Source: http://www.scirp.org/



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