Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/17388
Title: Phase transition and electrical properties of (K0.5Na 0.5)(Nb1-xTax)O3 lead-free piezoelectric ceramics
Authors: Lin, D
Kwok, KW 
Chan, HLW 
Issue Date: 2008
Publisher: Springer
Source: Applied physics. A, Materials science & processing, 2008, v. 91, no. 1, p. 167-171 How to cite?
Journal: Applied physics. A, Materials science & processing 
Abstract: (K0.5Na0.5)(Nb1-xTax)O 3 lead-free piezoelectric ceramics have been prepared by an ordinary sintering technique. The results of X-ray diffraction reveal that Ta 5+ diffuses into the K0.5Na0.5NbO3 lattices to form a solid solution with an orthorhombic perovskite structure. Because of the high melting temperature of KTaO3, the (K 0.5Na0.5)(Nb1-xTax)O3 ceramics can be sintered at higher temperatures. The partial substitution of Ta5+ for the B-site ion Nb5+ decreases both paraelectric/cubic-ferroelectric/tetragonal and ferroelectric/tetragonal- ferroelectric/orthorhombic phase transition temperatures, TC and TO-T. It also induces a relaxor phase transition and weakens the ferroelectricity of the ceramics. The ceramics become 'softened', leading to improvements in d33, kp, kt and εr and a decease in Ec, Qm and N p. The ceramics with x=0.075-0.15 become optimum, having d 33=127-151 pC/N, kp=0.43-0.44, kt=0.43-0.44, εr=541-712, tanδ=1.75-2.48% and TC=378-329 °C.
URI: http://hdl.handle.net/10397/17388
ISSN: 0947-8396
EISSN: 1432-0630
DOI: 10.1007/s00339-007-4391-0
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

60
Last Week
0
Last month
1
Citations as of Aug 14, 2017

WEB OF SCIENCETM
Citations

52
Last Week
0
Last month
0
Citations as of Aug 13, 2017

Page view(s)

24
Last Week
2
Last month
Checked on Aug 13, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.