Sintering characteristic, microstructure, and dielectric relaxor behavior of (K0.5Na0.5)NbO3-(Bi0.5Na 0.5)TiO3 lead-free ceramics

Hongliang Du, Wancheng Zhou, Dongmei Zhu, Luo Fa, Shaobo Qu, Ye Li, Zhibin Pei

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102 Scopus citations

Abstract

Highly dense lead-free ceramics (1-x)(K0.5Na0.5) NbO3-x(Bi0.5Na0.5)TiO3 [(1-x)KNN-xBNT] have been synthesized by pressureless sintering owing to the careful control of processing conditions. The densification of (1-x)KNN-xBNT ceramics improves with increasing addition of BNT. The translucence is observed in 0.96 KNN-0.04 BNT ceramics. Diffuse phase transition and frequency dispersion of the dielectric constant, which are two typical characteristics for relaxor ferroelectrics, are observed in (1-x)KNN-xBNT ceramics. Dielectric relaxor behavior obeys a modified Curie-Weiss law. In addition, (1-x)KNN-xBNT ceramics possess a high Curie temperature (>320°C). The results indicate that (1-x)KNN-xBNT (x=0.06) ceramics are promising lead-free candidate relaxor ferroelectrics for high-temperature applications.

Original languageEnglish
Pages (from-to)2903-2909
Number of pages7
JournalJournal of the American Ceramic Society
Volume91
Issue number9
DOIs
StatePublished - Sep 2008

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