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http://dx.doi.org/10.4191/KCERS.2010.47.4.333

Observation of Domain Structure and Polarization Switching in (001)-oriented Pb(Mg1/3Nb2/3)O3-x%PbTiO3 Single Crystals by Scanning Force Microscope  

Lee, Eun-Gu (Department of Advanced Materials Engineering, Chosun Unviversity)
Publication Information
Journal of the Korean Ceramic Society / v.47, no.4, 2010 , pp. 333-337 More about this Journal
Abstract
Domain structure and polarization switching in (001)-oriented $Pb(Mg_{1/3}Nb_{2/3})O_3-x%PbTiO_3$ (PMN-x%PT) crystals for x=20 and 35at% have been investigated in-situ by scanning force microscope (SFM) in a piezoresponse mode under a step DC electrical voltage. In the initial annealed condition, polar nano domains (PND) and domain striations oriented along {110} were observed in x=20 and x=35, respectively. For x=20, domain switching occurs by heterogeneous nucleation, where nucleation is not confined in the vicinity of domain boundaries, but rather can occur throughout the crystal volume. However, for x=35, domain switching tends to be preferentially initiated near pre-existing twin boundaries. With increasing the applying voltage, the nuclei density increased and assembled into {110} striations, indicating a stress-accommodated domain growth process. At higher voltage, nucleation occurs heterogeneously throughout the crystal volume.
Keywords
Polarization; Switching; Domain; SFM;
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