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- Title
Structure and electrical properties of the HoO doped 0.82BiNaTiO-0.18BiKTiO lead-free piezoelectric ceramics.
- Authors
Fu, Peng; Xu, Zhijun; Chu, Ruiqing; Wu, Xueyan; Li, Wei; Zhang, Huimin
- Abstract
HoO (0-0.7 wt%)-doped 0.82BiNaTiO-0.18BiKTiO (BNKT18) lead-free piezoelectric ceramics were synthesized by a conventional solid-state reaction method. The effects of HoO on the microstructure and electrical properties were investigated. X-ray diffraction data shows that HoO in an amount of 0.1-0.7 wt% can diffuse into the lattice of the BNKT18 ceramics and form the pure perovskite phase. Scanning electron microscope (SEM) images indicate that the grain sizes of BNKT18 ceramics decrease with the increase of HoO content; in addition, the modified ceramics have the clear grain boundary and a uniformly distributed grain size. At room temperature, the electrical properties of the BNKT18 ceramics have been improved with the addition of HoO, and the BNKT18 ceramics doped with 0.3wt.% HoO have the highest piezoelectric constant ( d = 137 pC/N), the highest remnant polarization ( P = 26.9 μC/cm), the higher relative dielectric constant ( ε = 980) and lower dissipation factor (tan δ = 0.046) at a frequency of 10 kHz. The BNKT18 ceramics doped with 0.1 wt% HoO have the highest planar coupling factor ( k = 0.2426).
- Subjects
HOLMIUM oxides; SCANNING electron microscopes; X-ray diffraction; MICROSTRUCTURE; ENERGY dissipation; PIEZOELECTRICITY
- Publication
Journal of Materials Science: Materials in Electronics, 2012, Vol 23, Issue 12, p2167
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-012-0734-5