Ferroelectricity enhancement in ferroelectric nanotubes

Details Ferroelectricity enhancement in ferroelectric nanotubes Ferroelectricity enhancement in ferroelectric nanotubes

2006-08-30

arxiv.org/abs/cond-mat/0608681v1

Physics

Condensed Matter

Materials Science

10 pages, 3 figures, to be presented at "VIII Ukrainian-Polish Meeting on Ferroelectrics"

Scientific paper

In this paper we study the size effects of the ferroelectric nanotube phase diagrams and polar properties allowing for effective surface tension and depolarization field influence. The approximate analytical expression for the paraelectric-ferroelectric transition temperature dependence on the radii of nanotube, polarization gradient coefficient, extrapolation length, surface tension and electrostriction coefficient was derived. It was shown that the transition temperature could be higher than the one of the bulk material for negative electrostriction coefficient. Therefore we predict conservation and enhancement of polarization in long ferroelectric nanotubes. Obtained results explain the observed ferroelectricity conservation and enhancement in Pb(Zr,Ti)O_3 and BaTiO_3 nanotubes.

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