Ferroelectricity in the Dion-Jacobson CsBiNb$_2$O$_7$ from first principles

Details Ferroelectricity in the Dion-Jacobson CsBiNb$_2$O$_7$ from first principles Ferroelectricity in the Dion-Jacobson CsBiNb$_2$O$_7$ from first principles

2006-03-06

arxiv.org/abs/cond-mat/0603140v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1063/1.2218040

We have studied ferroelectricity in Dion-Jacobson CsBiNb$_2$O$_7$ from first principles. Using group-theoretical analysis and first-principles density functional calculations of the total energy and phonons, we perform a systematic study of the energy surface around a paraelectric prototypic phase. Our results suggest that CsBiNb$_2$O$_7$ is a ferroelectric with a polarization of P$_s$=40$\mu$C cm$^{-2}$. We propose further experiments to clarify this point.

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