Abstract
The mechanisms of formation of a plateau in dependences of the reversible permittivity on the external electric field strength in a ceramic sample of the yPZN-mPMN-nPNN — xPT (x = 0, 3; y = 0.0982; m = 0.4541; n = 0.1477) system have been analyzed using X-ray diffraction and atomic force microscopy. It has been shown that, in electric fields corresponding to the permittivity anomaly, there occurs an induced phase transition from the heterophase (tetragonal + pseudocubic) state to the single-phase (tetragonal) state. This leads to significant strains of the tetragonal unit cell (up to 0.1%) and the termination of 90° domain switching. The proposed qualitative model of the formation of the observed dielectric anomaly is based on two processes occurring with an increase in the electric field strength: the growth of polar regions of the tetragonal phase and their switching.
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Original Russian Text © M.V. Talanov, O.A. Bunina, M.A. Bunin, I.N. Zakharchenko, L.A. Reznichenko, 2013, published in Fizika Tverdogo Tela, 2013, Vol. 55, No. 2, pp. 288–294.
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Talanov, M.V., Bunina, O.A., Bunin, M.A. et al. Electric-field-induced phase transition in the relaxor ceramics based on PMN-PT. Phys. Solid State 55, 326–333 (2013). https://doi.org/10.1134/S1063783413020339
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DOI: https://doi.org/10.1134/S1063783413020339