Publication Type:Journal Article
Source:Nano Letters, Volume 11, Number 3, p.1147-1152 (2011)
Keywords:Atomic scale, colloidal, Colloidal nanocrystals, Ferroelectric, Ferroelectric materials, ferroelectricity, Germanium, Germanium telluride, GeTe, Linear components, Nano scale, nanocrystals, phase transitions, polar, Polar ordering, room temperature, transmission electron microscopy
The question of the nature and stability of polar ordering in nanoscale ferroelectrics is examined with colloidal nanocrystals of germanium telluride (GeTe). We provide atomic-scale evidence for room-temperature polar ordering in individual nanocrystals using aberration-corrected transmission electron microscopy and demonstrate a reversible, size-dependent polar-nonpolar phase transition of displacive character in nanocrystal ensembles. A substantial linear component of the distortion is observed, which is in contrast with theoretical reports predicting a toroidal state. © 2011 American Chemical Society.
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