Ferroelectric, ferromagnetic and optical properties of KBiFe2O5 thin film: a structure property relationship

KBiFe2O5 thin film was prepared by spin-coating on platinized (111) Si wafer and characterized for its structure, microstructure, ferroelectric, magnetic and optical properties. X-ray diffraction (XRD) revealed a noncentrosymmetric, orthorhombic crystal structure of KBiFe2O5. The well-distributed de...

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Bibliographic Details
Published in:Materials research express 2017-01, Vol.4 (1)
Main Authors: Jalaja, M A, Predeep, P, Dutta, Soma
Format: Article
Language:English
Subjects:
ferroelectric properties
KBFO thin film
magnetic properties
optical properties
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Summary:KBiFe2O5 thin film was prepared by spin-coating on platinized (111) Si wafer and characterized for its structure, microstructure, ferroelectric, magnetic and optical properties. X-ray diffraction (XRD) revealed a noncentrosymmetric, orthorhombic crystal structure of KBiFe2O5. The well-distributed dense microstructure with large grain and narrow grain boundaries in KBiFe2O5 enhanced its ferroelectric properties. The strong, frequency-dependent behavior of the ferroelectric hysteresis loop suggested the leaky nature of the material. Piezoelectricity was confirmed by determining the piezoelectric charge coefficients (d33 = 2.82 nm V−1 at positive bias and 3.195 nm V−1 at negative bias voltage) from the field versus the displacement plot. The weak ferromagnetism of the film is attributed to the high spin state of Fe3+ in the FeO4 tetrahedron of KBiFe2O5. Optical properties (refractive indices and extinction coefficients) are studied from the reflectance spectrum. The refractive indices are higher in the visible region and showed a normal dispersion in the blue region. The bandgap of the film was calculated to be 1.61 eV.
ISSN:2053-1591
DOI:10.1088/2053-1591/4/1/016401