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X-ray study of the electric field-induced phase transition in single crystal Pb(Mg1/3Nb2/3)O3

Calvarin, Gilbert
Husson, E.
Published in Ferroelectrics. 1995, vol. 165, no. 1, p. 349-358
Abstract High-resolution X-ray diffraction experiments were performed on a single crystal of PMN in the temperature range of 90-300 K, by applying an electric field (up to E = 3.0 kV cm-1) along the [111] direction. A first order electric field-induced phase transition, from the mean cubic phase to a rhombohedral Phase, was evidenced by discontinuous variation of the d222-spacing upon cooling with E ≥ 1.8 kV cm-1. Results suggest that a tricritical point exists in the (E, Tc) phase diagram of PMN for E ≥ 3.8 kV cm-1. Upon field heating no phase coexistence was detected, unlike the field cooling runs, and the rhombohedral-cubic phase transition appears to be of second order at least for E = 3.0 kV cm-1.
Keywords Field-induced phase transitionX-ray diffractionTricritical pointPb(Mg1/3Nb2/3)O3
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CALVARIN, Gilbert, HUSSON, E., YE, Zuo-Guang. X-ray study of the electric field-induced phase transition in single crystal Pb(Mg1/3Nb2/3)O3. In: Ferroelectrics, 1995, vol. 165, n° 1, p. 349-358. doi: 10.1080/00150199508228315 https://archive-ouverte.unige.ch/unige:81199

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