Detecting depinning of polar nanoregions under dc external electric field in canonical relaxor ferroelectric Pb(Mg1/3 Ta2/3 )O3 via acoustic emission
| Autor: | Michael Roth, Evgeniy Dul'kin, Antoni Kania |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Condensed matter physics 02 engineering and technology Dielectric Atmospheric temperature range 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Nonlinear system Acoustic emission Critical point (thermodynamics) Electric field 0103 physical sciences Polar 010306 general physics 0210 nano-technology Maxima |
| Zdroj: | physica status solidi (b). 253:1937-1940 |
| ISSN: | 0370-1972 |
| DOI: | 10.1002/pssb.201600145 |
| Popis: | Canonical relaxor ferroelectric Pb(Mg1/3Ta2/3)O3 single crystals were studied via acoustic emission in temperature range of 180–250 K covering their dielectric constant temperature maximum at Tm ≈ 202 K, and under dc external electric fields up to 1.2 kV cm−1. The dependence of Tm on dc external electric field exhibits a nonlinear behavior, characteristic of relaxors: it initially decreases, attains a sharp minimum at the threshold field of 0.25 kV cm−1 and then starts to increase, as the field enhances. The count rate of the accompanying acoustic emission exhibits two maxima: at 0.1 and 0.6 kV cm−1. The latter obviously corresponds to the end critical point, also characteristic of relaxors, while the former is attributed to a polar nanoregions depinning field at which the polar nanoregions start to be switched off from the intrinsic random electric fields to the dc external electric field. These data are discussed from the viewpoint of competition between random electric fields and an external electric field when affecting the polar nanoregions. |
| Databáze: | OpenAIRE |
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