Temperature evolution of the local order parameter in relaxor ferroelectrics (1 -x)PMN-xPZT
✍ Scribed by Gridnev, S. A. ;Glazunov, A. A. ;Tsotsorin, A. N.
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 246 KB
- Volume
- 202
- Category
- Article
- ISSN
- 0031-8965
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✦ Synopsis
Abstract
The temperature dependence of the local order parameter and relaxation time distribution function have been determined in (1 – x)PMN–__x__PZT ceramic samples via dielectric permittivity. Above the Burns temperature, the permittivity was found to follow the Currie–Weiss law, and with temperature decreasing the deviation was observed to increase. A local order parameter was calculated from the dielectric data using a modified Landau–Devonshire approach. These results are compared to the distribution function of relaxation times. It was found that a glasslike freezing of reorientable polar clusters occurs in the temperature range of diffuse relaxor transition. The evolution of the studied system to more ordered state arises from the increased PZT content. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)