Deriving an Empirical Potential for Ferroelectric LiNbO3

Abstract
We describe the derivation of a potential model for ferroelectric lithium niobate, by means of fitting parameters in the potential to the experimentally determined structure and properties of the material. In doing so we highlight the strengths and limitations of the technique, compared to theoretical methods for calculating the parameters. We also see that it is important to include ionic polarisation directly in the fit, owing to the role of polarisation in stabilising the ferroelectric structure.

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