New evidence for rhombohedral symmetry in the relaxor ferroelectric Pb(Mg1/3Nb2/3)O3статья
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Дата последнего поиска статьи во внешних источниках: 9 апреля 2021 г.
Аннотация:Neutron diffraction data have been collected from powders of lead magnesium niobate (PMN) at 300 and 10 K, following their synthesis in an optimised two-step reaction. Subsequent Rietveld refinement indicates that macroscopic rhombohedral symmetry is obtained at both temperatures. Moreover, the existence of a polar structure at room temperature has been independently confirmed by second harmonic generation measurements. The derived crystal structures indicate R3m and R3c symmetry at 300 and 10 K, respectively. The significance of these results for an understanding of the mechanism of relaxor ferroelectricity in PMN is discussed.