TY - JOUR
KW - Transmission electron microscopy
KW - Room temperature
KW - Phase transitions
KW - Ferroelectric materials
KW - Nanocrystals
KW - Ferroelectricity
KW - Nanoscale
KW - Ferroelectric
KW - Atomic scale
KW - Colloidal
KW - Colloidal nanocrystals
KW - Germanium telluride
KW - GeTe
KW - Linear components
KW - Polar
KW - Polar ordering
KW - Germanium
AU - M.J Polking
AU - J.J Urban
AU - D.J Milliron
AU - H Zheng
AU - E Chan
AU - M.A Caldwell
AU - S Raoux
AU - C.F Kisielowski
AU - Joel W Ager
AU - Ramamoorthy Ramesh
AU - A Paul Alivisatos
AB - 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.
BT - Nano Letters
DO - 10.1021/nl104075v
LA - eng
M1 - 3
N1 - cited By 65
N2 - 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.
PY - 2011
SP - 1147
EP - 1152
T2 - Nano Letters
TI - Size-dependent polar ordering in colloidal GeTe nanocrystals
VL - 11
SN - 15306984
ER -