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- W2054335985 endingPage "122202" @default.
- W2054335985 startingPage "122202" @default.
- W2054335985 abstract "High resolution electron microscopy, electron diffraction and electron holography were used to study individual free-standing ∼ 30 nm barium titanate nanocrystals. Large unidirectional variations in the tetragonal distortion were mapped across the smaller nanocrystals, peaking to anomalously large values of up to 4% at the centers of the nanocrystals. This indicated that the nanocrystals consist of highly strained single ferroelectric domains. Simulations using an effective Hamiltonian for modeling a nanocrystal under a small depolarizing field and negative pressure qualitatively confirm this picture. These simulations, along with the development of a phenomenological model, show that the tetragonal distortion variation is a combined effect of: (i) electrostrictive coupling between the spontaneous polarization and strain inside the nanocrystal, and (ii) a surface-induced effective stress existing inside the nanodot. As a result, a 'strain skin layer', having a smaller tetragonal distortion relative to the core of the nanocrystal, is created." @default.
- W2054335985 created "2016-06-24" @default.
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- W2054335985 date "2014-03-04" @default.
- W2054335985 modified "2023-09-25" @default.
- W2054335985 title "The stabilization of a single domain in free-standing ferroelectric nanocrystals" @default.
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- W2054335985 doi "https://doi.org/10.1088/0953-8984/26/12/122202" @default.
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