Effect of ZnO on the structure, microstructure and electrical properties of KNN-modified piezoceramics

作者：Rubio Marcos F^*; Romero J J; Navarro Rojero M G; Fernandez J F

来源：Journal of the European Ceramic Society, 2009, 29(14): 3045-3052.

DOI：10.1016/j.jeurceramsoc.2009.04.026

• Grain growth
• Microstructure-final
• Piezoelectric properties
• Perovskites
• Actuators

The effects of ZnO addition on structure, microstructure and dielectric properties of (K0.44Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04)O-3 ceramics (KNL-NTS) are investigated. Doping provokes phase segregation, evidenced by the appearance of different types of grains and a tetragonal tungsten-bronze secondary phase at high ZnO doping levels. A clear increase of ferroelectric-paraelectric and orthorhombic-to-tetragonal phase transition temperatures with ZnO content is observed. This produces a reduction of the room temperature piezoelectric constants due to the reduction of the tetragonality (cla) ratio of the KNL-NTS structure.

• 出版日期2009-11