https://doi.org/10.1140/epjb/s10051-024-00741-0
Regular Article - Solid State and Materials
Dependence of optical and dielectric properties on heat treatment of calcium-doped manganites
1
Physics Department, Faculty of Science, Sohag University, 82524, Sohag, Egypt
2
Reactor Physics Department, Reactors Division, Nuclear Research Center, Egyptian Atomic Energy Authority, Cairo, Egypt
f
s.abuelhassan@science.sohag.edu.eg
Received:
25
March
2024
Accepted:
28
June
2024
Published online:
7
August
2024
This work investigates Nd0.7Ca0.3MnO3 (NCMO) samples, which were prepared using solid-state reaction and annealed at different temperatures (700, 800, and 900 °C). Our studies showed variations in impedance (Z), conductivity (σ), dielectric constant (ε), dielectric loss factor, and tan(δ) with frequency. From the analysis of AC conductivity, the semimetal behavior of the material was apparent when the annealing temperature increased. Impedance measurements showed characteristics of a capacitor’s dielectric material. The optical parameters of the NCMO samples were calculated from transmittance and reflectance measurements. The optical study showed that the samples have an indirect band energy gap. The resulting Eg values were 0.89, 0.94, 0.93, and 0.91 eV for the as-prepared sample and samples annealed at 700, 800, and 900 °C, respectively. With these energy gap values, the samples are suitable for photocatalysis applications in the visible light range, thus offering a low-cost alternative.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
