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Equilibrium Phase Structures for BiFeO3 Thin Films on LaAlO3 Substrate

The stable phase structure of BiFeO3 films on LaAlO3 substrate was studied. In the biaxial constrained case, it changes from a tetragonal phase to a rhombohedral one with the increase of film thickness. By reducing the degree of the constrain from the biaxial case to the uniaxial one, the film relaxes in a much smaller thickness to a rhombohedral phase and an enhanced piezoelectric response is predicted in comparison to that of biaxial constrained case.