Journal
CERAMICS INTERNATIONAL
Volume 38, Issue 3, Pages 1807-1813Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2011.10.003
Keywords
Piezoelectric properties; Lead-free piezoelectric ceramic; (K, Na) (Nb, Ta)O-3; Hydrothermal; HTMM
Categories
Funding
- National Nature Science Foundation of China (NSFC) [50872053, 50830201, 51172108]
- Natural Science Foundation of Jiangsu Province of China [BK2009020]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT0968]
- Program for New Century Excellent Talents in University [NCET-10-0070]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- NUAA [NJ2010010, NZ2010001]
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A facile hydrothermal route via high temperature mixing method was used to synthesize (K, Na) (Nb, Ta)O-3 lead-free piezoelectric ceramic powders. The influence of Ta doping and K+/(K++Na+) molar ratios in the starting solution on the resultant powders were investigated by X-ray diffraction, scanning electron microscope, transmission electron microscopy, and selected area electron diffraction. The Ta element was successfully doped into the alkaline niobate structure to form crystalline (K, Na) (Nb, Ta)O-3 lead-free piezoelectric ceramics powder. The microstructure, piezoelectric, ferroelectric, and dielectric properties of the sintered (K, Na) (Nb, Ta)O-3 ceramics from the obtained powders were investigated. The piezoelectric coefficient (d(33)), electromechanical coupling coefficient (k(p)), dielectric constant (epsilon(r)), and remnant polarization (P-r) of the sample sintered at 1180 degrees C show optimal values of 210 pC/N, 34.0%, 2302, and 19.01 mu C/cm(2), respectively. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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