Abstract
New (1 - x - y)Bi0.5Na0.5TiO3-xY0.5Na0.5TiO3-yBaTiO3lead-free ceramics have been prepared by a conventional ceramic fabrication technique, and their structure and electrical properties have been studied. A morphotropic phase boundary (MPB) of rhombohedral and tetragonal phases is formed at 0.04 < y < 0.10. As compared to pure Bi0.5Na0.5TiO3ceramic, the partial substitutions of Y3+for Bi3+and Ba2+for (Bi0.5Na0.5)2+in the A-sites of Bi0.5Na0.5TiO3lower effectively the coercive field Ecand increase the remanent polarization Prof the ceramics. Because of low Ec, large Prand the MPB, the ceramics with x = 0-0.02 and y = 0.06 exhibit the optimum piezoelectric properties: d33= 155-159 pC/N and kp= 28.8-36.7%. The temperature dependences of dielectric properties of the ceramics show relaxor-like behaviors. The ferroelectric properties at different temperature suggest that the ceramics may contain both the polar and non-polar regions near/above Td.
| Original language | English |
|---|---|
| Pages (from-to) | 291-297 |
| Number of pages | 7 |
| Journal | Journal of Materials Science: Materials in Electronics |
| Volume | 21 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1 Mar 2010 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Electrical and Electronic Engineering