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      Pb(Mg1/3Nb2/3)O3 (PMN) Relaxor: Dipole Glass or Nano-Domain Ferroelectric ?

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          Abstract

          Combining our comprehensive investigations of polarization evolution, soft-mode by Raman scattering and microstructure by TEM, and the results reported in the literatures, we show that prototypical relaxor Pb(Mg1/3Nb2/3)O3 (PMN) is essentially ferroelectric for T<Tc~225 K. Its anomalous dielectric behavior over a broad temperature range results from the reorientation of domains in the crystal. A physic picture of the structure evolution in relaxor is also revealed. It is found that nanometric ferroelectric domains (gennerally called as polar nano-region (PNR)) interact cooperatively to form micrometric domain. Such multiscale inhomogeneities of domain structure in addition to the well-known inhomogeneities of chemical composition and local symmetry are considered to play a crucial role in producing the enigmatic phenomena in relaxor system.

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          Most cited references13

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          Relaxorferroelectrics: An overview

          L. Cross (1994)
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            Geometrical percolation threshold of overlapping ellipsoids

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              Spherical random-bond–random-field model of relaxor ferroelectrics

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                Author and article information

                Journal
                16 January 2013
                Article
                1301.3615
                aa1d48aa-c94e-4a7c-859c-9e4f7eab574a

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

                History
                Custom metadata
                Advances in Ferroelectrics, (InTech, Rijeka, Croatia) 2012, pp. 51-67
                16 pages, 10 figures; http://www.intechopen.com/books/advances-in-ferroelectrics/pb-mg1-3nb2-3-o3-pmn-relaxor-dipole-glass-or-nano-domain-ferroelectric-
                cond-mat.mtrl-sci cond-mat.mes-hall

                Condensed matter,Nanophysics
                Condensed matter, Nanophysics

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