Abstract:A ferroelectric thin film epitaxially deposited on a substrate is usually subjected to the mixed mechanical boundary conditions that can neither be treated as purely fixed-strain boundaries nor purely fixed-stress ones, thus causing the inconsistency or inaccuracy for choice of the Helmholtz or Gibbs thermodynamic potential. It would be of interest to clarify this inconsistency and set up some rules for such a choice. In this work, we discuss various roadmaps to construct two types of modified thermodynamic po… Show more
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