Structural Transformation of Relaxor PbMg1/3Nb2/3O3 under Electric Field Switching

S. B. Vakhrushev; Вахрушев С. Б.; Yu. A. Bronwald; Бронвальд Ю. А.; S. A. Udovenko; Удовенко С. А.; E. Yu. Koroleva; Королева Е. Ю.; A. Yu. Molokov; Молоков А. Ю.

doi:10.31857/S0023476123600568

Structural Transformation of Relaxor PbMg1/3Nb2/3O3 under Electric Field Switching

Authors: Vakhrushev S.B.¹, Bronwald Y.A.¹, Udovenko S.A.², Koroleva E.Y.¹, Molokov A.Y.¹
Affiliations:
1. Ioffe Institute, Russian Academy of Sciences, 194021, St. Petersburg, Russia
2. Peter the Great St. Petersburg Polytechnic University, 195251, St. Petersburg, Russia
Issue: Vol 68, No 5 (2023)
Pages: 754-760
Section: ФИЗИЧЕСКИЕ СВОЙСТВА КРИСТАЛЛОВ
URL: https://journals.rcsi.science/0023-4761/article/view/137416
DOI: https://doi.org/10.31857/S0023476123600568
EDN: https://elibrary.ru/DOYPLN
ID: 137416

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Abstract

One from the most important features of relaxors is the possibility of inducing a stable ferroelectric phase in them by applying an electric field. This induced phase transition has been multiply investigated; in particular, the structural changes during the transition and its kinetics were traced. However, the processes occurring under electric field switching remain little-studied, and the structural transformation during switching generally has not been investigated at all. To fill in this gap, the temporal evolution of the pattern of Bragg and diffuse X-ray scattering in classical relaxor PbMg1/3Nb2/3O3 at T = 175 K during multiple switching of the direction of a dc external field E = ± 6.25 kV/cm has been traced. It is shown that the glasslike state decays and a mixed ferro-glass phase is formed after switched on a field. Switching the field sign leads to a rise of dipole-glass correlations; however, no signs of occurrence of an inhomogeneous state with limited regions of dipole-glass and ferroelectric phases were found. Switching the field to the initial direction causes rapid formation of the ferroelectric phase, without any rise in the dipole-glass correlations. A repeated switching leads to a decrease in the Bragg scattering intensity, related to the long-range order. This effect is presumably due to the occurrence of random weakly correlated ionic displacements, violating the long-range order.

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