Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/22957
Title: Piezoelectric and ferroelectric properties of Cu-doped K 0.5Na0.5NbO3 lead-free ceramics
Authors: Lin, D
Kwok, KW 
Chan, HLW 
Issue Date: 2008
Publisher: Institute of Physics Publishing
Source: Journal of physics. D, Applied physics, 2008, v. 41, no. 4, 045401 How to cite?
Journal: Journal of physics. D, Applied physics 
Abstract: CuO-doped K0.5Na0.5NbO3 (K 0.5Na0.5NbO3 + x mol% CuO) lead-free ceramics have been prepared by an ordinary sintering technique. The results of x-ray diffraction patterns show that all the ceramics possess a pure pervoskite structure with orthorhombic symmetry. Based on the symmetry-conforming principle of point defects, defect dipoles are formed by the acceptor dopant ions Cu 2+ and O2- vacancies along the polarization direction and remain in the original orientation, providing a restoring force to reverse the switched polarization, which results in double polarization-electric hysteresis loops for the ceramics with x ≥ 0.50 at 100 Hz. That is, the ferroelectric dipoles are back to their original orientation on the removal of electric field due to the strong restoring force generated by defect dipoles. As a result, the ceramics (x ≥ 0.5) become considerably 'hardened' and possess an extraordinarily high Qm (825-2523) and simultaneously the other piezoelectric properties remain reasonably good (kp = 39%, k t = 47% and d33 = 82 pC N-1).
URI: http://hdl.handle.net/10397/22957
ISSN: 0022-3727
EISSN: 1361-6463
DOI: 10.1088/0022-3727/41/4/045401
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