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Characterization of 57Fe-Enriched BiFeO3 Thin Films by Mössbauer Spectroscopy

57Fe-enriched BiFeO3 (BFO) thin films were fabricated on Pt/Ti/SiO2/Si substrates from a stoichiometric precursor solution by chemical solution deposition process. The Bi/Fe molar ratio of the BFO thin films was about 0.93. The crystallinity and surface morphology of the BFO thin films were improved by using a single-sintering technique. Mössbauer spectra of the BFO thin films were measured at room temperature, and the valence state of Fe ions was confirmed to be Fe3+ only. One of the BFO thin films fabricated by single-sintering at 550 °C showed a relatively saturated P–E hysteresis loop. The remanent polarization Pr and the coercive field Ec at 10 kHz were 59 µC/cm2 and 327 kV/cm, respectively, at room temperature.