Journal
SCRIPTA MATERIALIA
Volume 94, Issue -, Pages 25-27Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2014.09.008
Keywords
(K,Na)NbO3; Sodium nonstoichiometry; Piezoelectricity; R-T phase boundary
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Funding
- Fundamental Research Funds for the Central Universities [2012SCU04A01]
- National Science Foundation of China (NSFC) [51472169, 51272164, 51332003]
- Guizhou Province Key Laboratory Project [QCJ2011(232)]
- College of Materials Science and Engineering of Sichuan University
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A giant d(33) was attained in the 0.96(K0.46Na0.54+x)Nb0.95Sb0.05O3-0.04Bi(0.5)(Na0.82K0.18)(0.5)ZrO3 ceramic by doping nonstoichiometric sodium. A rhombohedral-tetragonal phase boundary is constructed in the ceramic with a wide Na+ nonstoichiometry. Enhanced piezoelectric activity (e.g. d(33) approximate to 496 pC N-1 and k(p) approximate to 47%) was observed in the ceramics with a 0.5% excess of Na+. In addition, enhanced stability of ferroelectricity and piezoelectricity is also shown in this ceramic. We suggest that such a giant piezoelectricity might spark enthusiasm for research into potassium sodium niobate ceramics. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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