Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/21656
Title: Structural dependence of piezoelectric, dielectric and ferroelectric properties of K 0.5Na 0.5(Nb 1-2x/5Cu x)O 3 lead-free ceramics with high Q m
Authors: Tan, X
Fan, H
Ke, S
Zhou, L 
Mai, YW
Huang, H 
Keywords: A. Ceramics
D. Defects
D. Piezoelectricity
Issue Date: 2012
Publisher: Pergamon Press
Source: Materials research bulletin, 2012, v. 47, no. 12, p. 4472-4477 How to cite?
Journal: Materials research bulletin 
Abstract: (K 0.5Na 0.5)(Nb 1-2x/5Cu x)O 3 (abbreviated as KNNC, x = 0-2%) lead-free ceramics were synthetized by the solid state solution method. Pure perovskite phase with orthorhombic symmetry was observed. The evolution of the structure of KNNC was examined by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman scattering spectra techniques. Our results revealed that, defect dipoles (Cu''' Nb-V O• •)' were formed and provided a restoring force to reverse the switched polarization, which resulted in double P-E hysteresis loops in KNNC with Cu doping at x = 0.75% and 1%. However, non-polar defect complex (V O••-Cu''' Nb-V O••) • caused a lattice shrinkage and the observed square shaped P-E loops in KNNC ceramics under high doping levels (x > 1%).
URI: http://hdl.handle.net/10397/21656
ISSN: 0025-5408
DOI: 10.1016/j.materresbull.2012.09.049
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