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    Polarization switching in (001)-oriented Pb(Mg1/3Nb2/3)O-3-x%PbTiO3 crystals: Direct observation of heterogeneous nucleation by piezoreponse force microscopy

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    Date
    2004-11-01
    Author
    Bai, Feiming
    Li, Jiefang
    Viehland, Dwight D.
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    Abstract
    Polarization switching in (001)-oriented Pb(Mg1/3Nb2/3)O-3-x%PbTiO3, PMN-x%PT, crystals for x=20 and 35 has been investigated in situ by scanning force microscopy in a piezoresponse mode, under a step-increased dc electrical voltage (V-dc). The results demonstrate that switching initiates by the nucleation of nanosized polar regions with a reversed polarization. For x=20, nucleation occurs heterogeneously throughout the volume of the crystal. However, with increasing PT content, nucleation tends to preferentially initiate near preexisting twin boundaries; with increasing V-dc, the domains becoming increasingly "diffuse" due to heterogeneous nucleation and growth throughout the crystal. (C) 2004 American Institute of Physics.
    URI
    http://hdl.handle.net/10919/25267
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    • Scholarly Works, Materials Science and Engineering (MSE) [398]

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