Sang Yong-Liang et al 2008 Chinese Phys. Lett. 25 1113 doi:10.1088/0256-307X/25/3/083
Sang Yong-Liang1, Liu Bin1,2 and Fang Dai-Ning1
Show affiliationsThe strain and size effects on the ferroelectric properties of BaTiO3 films are studied using the molecular dynamics method based on a shell model. It is found that from microscopic view, these two effects share the same physical nature, i.e., the resulting crystal cell distortions lead to the separation of negative and positive charge centres. The strain and size effects are therefore coupled, and the critical thicknesses of films would depend on the in-plane strains, which provides a possible interpretation on the discrepancies among the experimental measurements of the critical thicknesses. A polarization map is given to clearly reflect the relations among the size, strain and polarization of the nano films.
77.55.+f Dielectric thin films
77.84.Dy Niobates, titanates, tantalates, PZT ceramics, etc.
77.80.-e Ferroelectricity and antiferroelectricity
Issue 3 (March 2008)
Received 2 January 2008
Sang Yong-Liang et al 2008 Chinese Phys. Lett. 25 1113
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