Abstract
PbFe1/2Nb1/2O3 ferroelectrics crystals have been investigated using an acoustic emission. All the characteristic points have been detected: the Néel antiferromagnetic-paramagnetic phase transition at 158.6 K, both the rhombohedral-tetragonal at 363-348 K and tetragonal-cubic at 382-365 K structural phase transitions, the intermediate temperature T at 431-427.5 K and the Burns temperature Td, extending through 564-603 K. It is shown that a dielectric response is unable to locate the Td correctly, but both the thermal expansion and acoustic emission are able. Acoustic emission is found to be more powerful for T than for Td, which is usually observed in some well known relaxor ferroelectrics. Such a phenomenon is discussed from a viewpoint of dynamics of polar nanoregions.
| Original language | English |
|---|---|
| Article number | 016105 |
| Journal | Materials Research Express |
| Volume | 1 |
| Issue number | 1 |
| DOIs | |
| State | Published - Mar 2014 |
Bibliographical note
Publisher Copyright:© 2014 IOP Publishing Ltd.
Keywords
- Acoustic emission
- Burns temperature
- Intermediate temperature
- Phase transitions
- Relaxor ferroelectrics
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