Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16914
Title: Microstructure, dielectric and piezoelectric properties of (K 0.5Na0.5)NbO3-Ba(Ti0.95Zr 0.05)O3 lead-free ceramics with CuO sintering aid
Authors: Lin, D
Kwok, KW 
Chan, HLW 
Issue Date: 2007
Publisher: Springer
Source: Applied physics. A, Materials science & processing, 2007, v. 88, no. 2, p. 359-363 How to cite?
Journal: Applied physics. A, Materials science & processing 
Abstract: Using an ordinary ceramic fabrication technique, we fabricated lead-free (1-x)(K0.5Na0.5)NbO3-xBa(Ti 0.95Zr0.05)O3 ceramics with CuO sintering aid . Ba(Ti0.95Zr0.05)O3 diffuses into (K 0.5Na0.5)NbO3 to form a new solid solution. The ceramics with perovskite structure possess orthorhombic phase at x ≤ 0.04 and become tetragonal phase at ≥ 0.06. Both the paraelectric cubic-ferroelectric tetragonal and the ferroelectric tetragonal-ferroelectric orthorhombic phase transition temperatures decrease with increasing the concentration of Ba(Ti0.95Zr0.05)O3. The doping of CuO effectively promotes the densification of the ceramics. The coexistence of the orthorhombic and tetragonal phases at 0.04<x<0.06 and the improvement in sintering performances of the ceramics significantly enhance the piezoelectric and dielectric properties at room temperature. The ceramics with x=0.04-0.06 and y=0.75-1.50 possess excellent properties: d33=119-185 pC/N, kP=37-44%, kt=35-49%, ε=341-1129, cosδ=0.7-4.4% and Tc=312-346 °C.
URI: http://hdl.handle.net/10397/16914
ISSN: 0947-8396
EISSN: 1432-0630
DOI: 10.1007/s00339-007-3967-z
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