A random-field model for polarization reversal in Pb(Yb1/2Nb1/2)O3-PbTiO3 single crystals
作者： Shujun Zhang , Shashank Priya , Eugene Furman , Thomas R. Shrout , Clive A. Randall
DOI: 10.1063/1.1467399
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摘要: Polarization switching and dielectric temperature behavior have been investigated in 0.55Pb(Yb1/2Nb1/2)O3–0.45PbTiO3 (PYN–PT) single crystals. These compositions are of interest owing to their unusually high Curie coercive fields. The permittivity was determined as function the polarization measured a applied field for different drive frequencies. Analysis experimental results with random-field model found show similar trends recent reports Pb(Mg1/3Nb2/3)O3 relaxor materials. frequency dispersion maximum spectra, Tmax, also analyzed Vogel–Fulcher relation yielding freezing 577 K. follow stretched exponential time dependence fractal dimension ∼2.2 obtained. It is proposed that polar cluster state PYN-PT crystals do not freeze random orientations but rather arrange locally preferred c...
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