Microstructure and electrical properties of Ti-modified (Na0.5K0.5)(TiχNb1-χ)O3 lead-free piezoelectric ceramics

稀有金属（英文版）, 2009, 28(2): 142-146. doi: 10.1007/s12598-009-0028-0

^1, , ^2, , ^3, , ^4, , ^5,

1.School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China

2.School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China

3.School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China

4.School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China

5.School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China

基金项目: 国家高技术研究发展计划(863计划)(2006AA03Z436) 国家自然科学基金(50842028)

Microstructure and electrical properties of Ti-modified (Na0.5K0.5)(TiχNb1-χ)O3 lead-free piezoelectric ceramics

ZHANG Qian ^1, , ZHANG Boping ^2, , ZHAO Pei ^3, , LI Haitao ^4, , ZHANG Limin ^5,

1.School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China

2.School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China

3.School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China

4.School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China

5.School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China

Keywords： lead-free piezoelectric ceramics

Ti-Modified (Na0.5K0.5)(TixNb1-x)O3 (NKNT) piezoelectric ceramics were fabricated by double-layer buffed powder process at 1020℃ for 2 h. The microstructures, and piezoelectric and dielectric properties of the lead-free NKNT ceramics were investigated. X-ray diffraction re-suits 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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材料期刊网

Microstructure and electrical properties of Ti-modified (Na0.5K0.5)(TiχNb1-χ)O3 lead-free piezoelectric ceramics

参考文献