Abstract
Lead-free (1-x) K0.5Na0.5NbO3-xBi0.5Li0.5TiO3+ 1 mol% MnO2piezoelectric ceramics have been prepared by a conventional ceramic technique and their structure and piezoelectric properties have been studied. Our results reveal that Bi0.5Li0.5TiO3diffuse into K0.5Na0.5NbO3lattices to form a solid solution with a perovskite structure. The addition of Bi0.5Li0.5TiO3to the K0.5Na0.5NbO3solid solution decreases the paraelectric cubic-ferroelectric tetragonal phase transition temperature (TC) slightly, but shifts the ferroelectric tetragonal-ferroelectric orthorhombic phase transition temperature (TO-T) significantly to low temperatures. As a result, coexistence of the orthorhombic and tetragonal phases is formed at 0.01 < x < 0.03 near room temperature, leading to a significant improvement in the piezoelectric properties of the ceramics. The ceramic with x = 0.025 exhibits a relatively high TC(392 °C) and optimum piezoelectric properties: d33= 191 pC/N, kp= 51.5% and kt= 45.5%. The ceramic also exhibit a good thermal stability of piezoelectric properties.
| Original language | English |
|---|---|
| Pages (from-to) | 501-505 |
| Number of pages | 5 |
| Journal | Journal of Materials Science: Materials in Electronics |
| Volume | 23 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 1 Feb 2012 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Electrical and Electronic Engineering