First-Principles Determination of Chain-Structure Instability in KNbO$_3$

Details First-Principles Determination of Chain-Structure Instability in KNbO$_3$ First-Principles Determination of Chain-Structure Instability in KNbO$_3$

1994-12-21

arxiv.org/abs/mtrl-th/9412008v1

Physics

Condensed Matter

Materials Science

13 pages, latex, 3 uuencoded postscript figures

Scientific paper

10.1103/PhysRevLett.74.4067

A complete mapping in the Brillouin zone of the structural instability associated with the ferroelectric phase transitions of KNbO$_3$ has been obtained by first-principles calculations using an LAPW linear response approach. The wavevector dependence of the instability reveals pronounced two-dimensional character, which corresponds to chains oriented along $\left<100\right>$\ directions of displaced Nb atoms. The results are discussed in relation to models of the ferroelectric phase transitions.

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