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Samarium substituted bismuth ferrite (BiFeO3) ceramics prepared by sol-gelsynthesis method were studied using both local scale and microscopicmeasurement techniques in order to clarify an evolution of the crystalstructure of the compounds across the morphotropic phase boundary region. X-raydiffraction analysis, transmission and scanning electron microscopies, XPS,EDS/EDX experiments and piezoresponse force microscopy were used to study thestructural transitions from the polar active rhombohedral phase to theanti-polar orthorhombic phase and then to the non-polar orthorhombic phase,observed in the Bi1-xSmxFeO3 compounds within the concentration range of 0.08 <x < 0.2. The results obtained by microscopic techniques testify that thecompounds in the range of 0.12 < x < 0.15 are characterized by two phasestructural state formed by a coexistence of the rhombohedral and the anti-polarorthorhombic phases; two phase structural state observed in the compounds with0.15 < x < 0.18 is associated with a coexistence of the anti-polar orthorhombicand the non-polar orthorhombic phases. Local scale measurements have revealed anotable difference in the concentration range ascribed to the morphotropicphase boundary estimated by microscopic measurements, the obtained resultstestify a wider concentration range ascribed to a coexistence of differentstructural phases, the background of the mentioned difference is discussed.

Morphotropic Phase Boundary in Sm-Substituted BiFeO3 Ceramics: Local vs Microscopic Approaches