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Room-temperature multiferroic behavior in the three-layer Aurivillius compound Bi3.25La0.75Ti2Nb0.5(Fe1-x Cox)0.5O12

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Abstract

Multiferroic Bi3.25La0.75Ti2Nb0.5(Fe1-xCox)0.5O12 ceramics with x = 0, 0.3, 0.4 and 0.5 were synthesized by a conventional solid-state reaction route to evaluate the effects of cobalt doping on structural, electrical and magnetic properties. All samples display layered perovskite Aurivillius phase with typical microstructure of plate-like grains. The grain size decreases with increasing Co content, from ∼5 μm to ∼1 μm. Room-temperature dielectric permittivity values range from 160 (x = 0) to 210 (x = 0.5) with negligible frequency dispersion and losses below 0.02 in a wide frequency range. A decrease of the Curie temperature with Co addition was observed. The Co-doped ceramics display well-defined ferroelectric and ferromagnetic hysteresis loops at room temperature. The best magnetic properties are obtained for x = 0.3 and x = 0.4 with a remnant magnetization of ∼0.1 emu/g. Butterfly-type hysteresis loops are observed for the magnetodielectric response using a measurement protocol that can be useful for other single-phase multiferroic materials. The MD coefficient does not depend on frequency and the maximum value (∼0.5%) is obtained for cobalt content x = 0.3. So, these multiferroic three-layer Aurivillius compounds may be considered as promising candidates for memory applications.

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Acknowledgements

We thank Augusto Roman and Laura Steren for the magnetic measurements. We also thank Pablo Diaz for SEM measurements. This work was sponsored by Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET) de la República Argentina. MGS thanks also support from Consejo de Investigaciones de la Universidad Nacional de Rosario (CIUNR). Eiras and Alkathy are greatly indebted to the Sao Paulo Research Foundation (FAPESP: Grant no# 2017/13769-1) and (FAPESP: Grant no# 2019/03110-8).

Funding

This research was funded by CONICET, Grant no [PIP 00249], FAPESP Grant nos [2017/13769-1, 2019/03110-8].

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Authors and Affiliations

  1. Instituto de Física Rosario, Universidad Nacional de Rosario, 27 de Febrero 210 Bis, 2000, Rosario, Argentina

    C. Lavado & M. G. Stachiotti

  2. Departamento de Física, Universidade Federal do Säo Carlos, Caixa Postal 676, Säo Carlos, Säo Paulo, 13565-670, Brazil

    Mahmoud. S. Alkathy & J. A. Eiras

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  1. C. Lavado
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Lavado, C., Alkathy, M.S., Eiras, J.A. et al. Room-temperature multiferroic behavior in the three-layer Aurivillius compound Bi3.25La0.75Ti2Nb0.5(Fe1-x Cox)0.5O12. Appl. Phys. A 129, 147 (2023). https://doi.org/10.1007/s00339-023-06445-z

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