Microstructure and electrical properties of Ti-modified (Na0.5K0.5)(TixNb1-x)O3 lead-free piezoelectric ceramics
来源期刊：Rare Metals2009年第2期
论文作者：ZHANG Qian,ZHANG Boping,ZHAO Pei,LI Haitao,and ZHANG Limin School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing ,China
文章页码：142 - 146
摘 要：Ti-Modified （Na0.5K0.5）（TixNb1-x）O3 （NKNT） piezoelectric ceramics were fabricated by double-layer buried powder process at 1020°C for 2 h. The microstructures,and piezoelectric and dielectric properties of the lead-free NKNT ceramics were investigated. X-ray diffraction re-sults indicated that Ti4+ had diffused into the （Na0.5K0.5）NbO3 lattices to form a solid solution with a perovskite structure. The introducing of Ti into the （Na0.5K0.5）NbO3 solid solution effectively reduced the sintering temperature and densified the microstructure with a decreased grain size. The highest relative density reached more than 90%. The highest piezoelectric dielectric coefficient d33 and planar mode electro-mechanical coupling coefficient kp were 110 pC/N and 19.5%,which were obtained in the NKNT ceramic with 1 mol% Ti. The piezoelectric properties of the NKNT ceramics were enhanced by aging in air for a period of time owing to the compensation of oxygen vacancies.
摘要：Ti-Modified （Na0.5K0.5）（TixNb1-x）O3 （NKNT） piezoelectric ceramics were fabricated by double-layer buried powder process at 1020°C for 2 h. The microstructures,and piezoelectric and dielectric properties of the lead-free NKNT ceramics were investigated. X-ray diffraction re-sults indicated that Ti4+ had diffused into the （Na0.5K0.5）NbO3 lattices to form a solid solution with a perovskite structure. The introducing of Ti into the （Na0.5K0.5）NbO3 solid solution effectively reduced the sintering temperature and densified the microstructure with a decreased grain size. The highest relative density reached more than 90%. The highest piezoelectric dielectric coefficient d33 and planar mode electro-mechanical coupling coefficient kp were 110 pC/N and 19.5%,which were obtained in the NKNT ceramic with 1 mol% Ti. The piezoelectric properties of the NKNT ceramics were enhanced by aging in air for a period of time owing to the compensation of oxygen vacancies.
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