Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/31281
Title: Effects of MnO2 on the microstructure and electrical properties of 0.94(K0.5Na0.5)NbO3-0.06Ba(Zr0.05Ti0.95)O3 lead-free ceramics
Authors: Lin, D
Kwok, KW 
Chan, HLW 
Keywords: Ceramics
Ferroelectricity
Piezoelectricity
Sintering
Issue Date: 2008
Source: Materials chemistry and physics, 2008, v. 109, no. 2-3, p. 455-458 How to cite?
Journal: Materials Chemistry and Physics 
Abstract: Lead-free ceramics MnO2-doped 0.94(K0.5Na0.5)NbO3-0.06Ba(Zr0.05Ti0.95)O3 have been fabricated by an ordinary sintering technique and the effects of MnO2 on the microstructure and electrical properties of the ceramics have been studied. Our results reveal that a small amount of MnO2 (0.50-1.00 mol%) can improve effectively the densification and electrical insulation of the ceramics. For 1 mol% MnO2-doped 0.94(K0.5Na0.5)NbO3-0.06Ba(Zr0.05Ti0.95)O3 ceramics, the ferroelectric tetragonal-ferroelectric orthorhombic phase transition (TO-T) resides near room temperature, indicating the coexistence of the orthorhombic and tetragonal phases at room temperature. Because of high densification, good electrical insulation, the donor- and acceptor-doping effects of MnO2, and the coexistence of the orthorhombic and tetragonal phases, the piezoelectric and dielectric properties of the ceramics are improved considerably. The 0.94(K0.5Na0.5)NbO3-0.06Ba(Zr0.05Ti0.95)O3 ceramics with 1.00 mol% MnO2 doping possess optimum properties: d33 = 234 pC/N, kp = 49%, kt = 48%, εr = 1191, tan δ = 1.20% and Tc = 318 °C.
URI: http://hdl.handle.net/10397/31281
ISSN: 0254-0584
DOI: 10.1016/j.matchemphys.2007.12.015
Appears in Collections:Journal/Magazine Article

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

SCOPUSTM   
Citations

44
Last Week
0
Last month
0
Citations as of Mar 19, 2017

WEB OF SCIENCETM
Citations

43
Last Week
0
Last month
1
Citations as of Mar 25, 2017

Page view(s)

33
Last Week
1
Last month
Checked on Mar 26, 2017

Google ScholarTM

Check

Altmetric



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