The structural and piezoelectric properties of the xmol% MnO 2-added 0.95(Na0.5-x/200K0.5-x/200)NbO 3-0.05SrTiO3 [(NK)xMN-ST] ceramics were investigated. A dense microstructure with enlarged grains was formed for the specimens sintered at 1040°C through liquid-phase sintering. However, the grain size decreased for the specimen sintered at 1060°C because of the formation of a large amount of the liquid phase. Therefore, the microstructural variations in the (NK)xMN-ST ceramics can be explained by liquid-phase-assisted abnormal grain growth. The specimens sintered at 1020 and 1060°C showed low piezoelectric properties because of their low relative density and small grain size, respectively. On the other hand, the (NK)xMN-ST ceramic with x = 0.1 sintered at 1040°C showed promising piezoelectric properties: d33 =260pC/N, kp = 0.42, Qm = 202 and εT 33/ε0 = 1291.
- Lead free
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
- Metals and Alloys
- Surfaces, Coatings and Films