Abstract
The threshold field, Et, values for various barium titanate and PZT-based ceramics have been determined by examination of the εr′-E0 relationships. The results obtained for both 'soft' and 'hard' PZT ceramics gave a good fit to the Rayleigh Law over a wide range of field amplitude for E0>Et. The linear increases in εr′ and εr″ as a function of field amplitude were attributed to a lossy ferroelectric domain wall translation mechanism, by analogy with similar behaviour in ferromagnetic materials. At high field levels approaching the coercive field, Ec, the measured εr′-E0 and εr″-E0 curves deviated from a linear relationship due to the onset of partial ferroelectric domain switching. Pure and Mn-doped barium titanate ceramics exhibited nonlinear εr′-E0 and εr″-E0 plots with a gradually increasing gradient. However, all of the materials studied yielded a linear εr′-εr″ relationship, from which a critical field for the initiation of ferroelectric domain switching, Esw, could be determined. © 1999 OPA (Overseas Publishers Association) N.V.
| Original language | English |
|---|---|
| Pages (from-to) | 319-328 |
| Number of pages | 9 |
| Journal | Ferroelectrics |
| Volume | 223 |
| Issue number | 1-4 |
| Publication status | Published - 1999 |
Keywords
- Domain switching
- Ferroelectric ceramics
- Rayleigh behaviour
- Threshold field