Abstract
Doped LaFeO3 materials are of high utility for energy storage devices and gas sensors. This work explores the effect of particles size and the preparation method on the physico-chemical properties of the (La0.8Ca0.2)0.6Bi0.4FeO3 compound. Accordingly, it was prepared by the Sol–Gel (LCBFO-SG) and the solid-state (LCBFO-SS) reaction methods. According to the Rietveld method, the adjusted XRD data confirm the distorted orthorhombic phase for both compounds. For both samples, the giant dielectric constant and the low loss tangent showed two relaxation processes at high- (grains boundary) and low-temperature regions (grains). The Havriliak-Negami ana Bergman formalism, used to adjust the imaginary part of dielectric Modulus, confirmed a non-Debye dielectric process. For both compounds, the conduction mechanism is ascribed to the non-Overlapping Small Polaron hopping between iron states. Importantly, Gas-sensing tests revealed that the LCBFO-SG nanoparticles exhibited higher response values and fast response/recovery times to ethanol, acetone, and H2S gases which is correlated with its lowest particles size. These results confirm that the LCBFO-SG could be an effective candidate for multi-gas sensors.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
The authors would like to acknowledge the financial support from: (1) The Deanship of Scientific Research at Jouf University under Grant No. DSR-2021-03-03145. (2) Fundação para a Ciência e a Tecnologia (FCT), Portugal, under the Projects No. UID/04564/2020 and UID/CTM/50025/2013 I3N and for the PhD Grant No. SFRH/BD/117487/2016. (3) QREN-Mais Centro Project No. ICT_2009_02_012_1890.
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AB, EMB, BMGM, AT: investigation conceptualization writing—original draft validation; MB, ED, MPFG, MAV, BFOC: validation writing—review and editing; LP, JW: funding acquisition—formal analysis.
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Benali, A., Benali, E.M., Melo, B.M.G. et al. Significant improvement of dielectric, magnetic, and gas-sensing properties of the (La0.8Ca0.2)0.6Bi0.4FeO3 nanomaterial: particles size effects. J Mater Sci: Mater Electron 34, 45 (2023). https://doi.org/10.1007/s10854-022-09408-x
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DOI: https://doi.org/10.1007/s10854-022-09408-x