Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 91, Issue 9, Pages 2903-2909Publisher
WILEY
DOI: 10.1111/j.1551-2916.2008.02528.x
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Funding
- Doctorate Foundation of Northwestern Polytechnical University [CX200609]
- Chinese National and Shaanxi Provincial Natural Science Foundation [50632030, 2006E135]
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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 degrees C). The results indicate that (1-x)KNN-xBNT (x = 0.06) ceramics are promising lead-free candidate relaxor ferroelectrics for high-temperature applications.
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