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Relaxor ferroelectric Pb(Mg1/3Nb2/3)O3 : Properties and present understanding

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Published in Ferroelectrics. 1996, vol. 184, no. 1, p. 193-208
Abstract The relaxor ferroelectric Pb(Mg<sub>1/3</sub> Nb<sub>2/3</sub> )O<sub>3</sub> [PMN] has been extensively studied in the last years. A short overview is presented on various physical models and microstructural features of PMN to understand the peculiar properties of this material. Some important aspects related to the electric field-induced first-order phase transition, from the average cubic phase to a macroscopically ferroelectric 3m phase, are discussed on the basis of an E-T phase diagram. The induced ferroelectric phase transition is characterized by an intrinsic Curie temperature Tco=213 K associated with a threshold field strength Eth=1.75 KV/cm, and a tricritical point at which the first-order transition changes into a second-order. The relationship is discussed between the compositionally non-stoichiometric nanoclusters and the induced polar macrodomain. The mechanism of the induced phase transition can be described as a transformation from nanodomain states to macrodomain states with long-range symmetry breaking, revealing the induced ferroelectric nature of PMN.
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YE, Zuo-Guang. Relaxor ferroelectric Pb(Mg1/3Nb2/3)O3 : Properties and present understanding. In: Ferroelectrics, 1996, vol. 184, n° 1, p. 193-208. https://archive-ouverte.unige.ch/unige:81201

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Deposited on : 2016-03-02

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