Quasi-two-dimensional ferroelectricity in KNb[O.sub.3]/KTa[O.sub.3] superlattices

First-principles density functional theory is used to calculate the phonon spectrum in the paraelectric phase, the ground-state structure and polarization distribution in the polar phase, and energies of ferro- and antiferroelectrically ordered phases of free-standing [(KNb[O.sub.3]).sub.1][(KTa[O.s...

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Bibliographic Details
Published inPhysics of the solid state Vol. 53; no. 12; pp. 2463 - 2467
Main Author Lebedev, A.I
Format Journal Article
LanguageEnglish
Published Springer 01.12.2011
Subjects
Dielectric films
Polyvinylidene fluoride
Thin films
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Summary:First-principles density functional theory is used to calculate the phonon spectrum in the paraelectric phase, the ground-state structure and polarization distribution in the polar phase, and energies of ferro- and antiferroelectrically ordered phases of free-standing [(KNb[O.sub.3]).sub.1][(KTa[O.sub.3]).sub.n] ferroelectric superlattices with n = 1-7. It is established that quasi-two-dimensional ferroelectricity with polarization oriented in the layer plane, which weakly interacts with polarization in neighboring layers, appears in potassium niobate layers with a thickness of one unit cell in the superlattices. The possibility of using of such ferroelectric superlattices as a medium for three-dimensional information recording is shown.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783411120122