Abstract
The concept of elastic domains is extended to heterophase ferroelectric epitaxial films undergoing phase transformation. Equilibrium nanostructure of ferroelectric phases forming heterophase polydomains, including their relative domain fraction, the distortion of phases, and the orientation of domain interfaces, is determined. The enhanced field induced response of polydomain nanostructures to external field due to domain interface movement is estimated. As an example, rhombohedral-tetragonal polydomain nanostructures in ferroelectric BiFeO3 film are considered.
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