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- Title
Dielectric and piezoelectric properties of MnO<sub>2</sub>-doped K<sub>0.5</sub>Na<sub>0.5</sub>Nb<sub>0.92</sub>Sb<sub>0.08</sub>O<sub>3</sub> lead-free ceramics.
- Authors
Dunmin Lin; Qiaoji Zheng; Kwok, K. W.; Chenggang Xu; Chun Yang
- 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: d33 = 187 pC/N, kP = 47.2%, εr = 980, tan δ = 2.71% and Tc = 287 °C. Due to high tetragonal-orthorhombic phase transition temperature ( TO-T ~ 150 °C), the K0.5Na0.5Nb0.92Sb0.08O3 ceramic with 0.5 mol%MnO2 doping exhibits a good thermal stability of piezoelectric properties.
- Subjects
DIELECTRICS; PIEZOELECTRICITY; ISOSTATIC pressing; SUBSTITUTION (Technology); POWDER metallurgy
- Publication
Journal of Materials Science: Materials in Electronics, 2010, Vol 21, Issue 7, p649
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-009-9971-7