Pinning and depinning mechanism of defect dipoles in PMnN–PZT ceramics
| Autor: | Zhi Gang Zhu, Bao Shan Li, Guorong Li, Qing Rui Yin, Wenwu Cao, Ai Li Ding |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Materials science
Acoustics and Ultrasonics Condensed matter physics Frequency dependence Coercivity Dielectric hysteresis Condensed Matter Physics Polarization (waves) Ferroelectricity Surfaces Coatings and Films Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Dipole visual_art visual_art.visual_art_medium Ceramic Bias field |
| Zdroj: | Journal of Physics D: Applied Physics. 38:1107-1111 |
| ISSN: | 1361-6463 0022-3727 |
| DOI: | 10.1088/0022-3727/38/8/001 |
| Popis: | The frequency and temperature dependences of the hysteresis loops in Pb[(Zr0.52Ti0.48)0.95(Mn1/3Nb2/3)0.05]O3 ceramics have been investigated. The polarization-field hysteresis curves show ‘pinched’ shapes at room temperature and higher frequencies, whereas they display normal square-like loops at 200uC and frequencies lower than 10 mHz. Critical ferroelectric features such as the coercive field, polarization and internal bias field show a strong frequency or temperature dependence. The close relations between the P –E loops and the applied frequency and temperature indicate that the defect dipolar moment may change its magnitude with variation of the frequency or temperature. Comparing with the intrinsic depinning procedure induced by the changes in the distribution of defect dipoles, we provide new evidence for an extrinsic depinning mechanism of the defect dipoles in the bulk ceramics. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|