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

Jalaja, MA and Predeep, P and Dutta, Soma (2017) Ferroelectric, ferromagnetic and optical properties of KBiFe2O5 thin film: A structure property relationship. Materials Research Express, 4 (1). ISSN 20531591

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Official URL: https://iopscience.iop.org/article/10.1088/2053-15...

Abstract

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 (d 33 = 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.

Item Type: Article
Subjects: PHYSICS > Solid-State Physics
PHYSICS
Depositing User: Mrs SK Pratibha
Date Deposited: 14 Jun 2019 17:22
Last Modified: 14 Jun 2019 17:22
URI: http://nal-ir.nal.res.in/id/eprint/13128

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