Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/14344
Title: Dielectric and piezoelectric properties of MnO2-doped K0.5Na0.5Nb0.92Sb0.08O3 lead-free ceramics
Authors: Lin, D
Zheng, Q
Kwok, KW 
Xu, C
Yang, C
Issue Date: 2010
Source: Journal of materials science : materials in electronics, 2010, v. 21, no. 7, p. 649-655
Abstract: Lead-free MnO2-doped K0.5Na0.5Nb0.92Sb0.08O3 ceramics have been fabricated by a conventional ceramic technique and their dielectric and piezoelectric properties have been studied. Our results show that a small amount of MnO2 (0.5-1.0 mol%) is enough to improve the densification of the ceramics and decrease the sintering temperature of the ceramics. The co-effects of MnO2 doping and Sb-substitution lead to significant improvements in the ferroelectric and piezoelectric properties. The K0.5Na0.5Nb0.92Sb0.08O3 ceramic with 0.5 mol%MnO2 doping possesses optimum propeties: d (33) = 187 pC/N, k (P) = 47.2%, epsilon (r) = 980, tan delta = 2.71% and T (c) = 287 A degrees C. Due to high tetragonal-orthorhombic phase transition temperature (T (O-T) similar to 150 A degrees C), the K0.5Na0.5Nb0.92Sb0.08O3 ceramic with 0.5 mol%MnO2 doping exhibits a good thermal stability of piezoelectric properties.
Publisher: Springer
Journal: Journal of materials science : materials in electronics 
ISSN: 0957-4522
EISSN: 1573-482X
DOI: 10.1007/s10854-009-9971-7
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