https://doi.org/10.1140/epjp/s13360-025-06307-y
Regular Article
High dielectric constant in calcium-substituted GdMnO3 for storage device applications
1
Department of Physics, Faculty of Engineering and Technology (ITER), Siksha ‘O’ Anusandhan Deemed to be University, Khandagiri Square, 751030, Bhubaneswar, Odisha, India
2
Department of Physics, College of Basic Science and Humanities, Odisha University of Agriculture and Technology, 751003, Bhubaneswar, Odisha, India
Received:
28
October
2024
Accepted:
8
April
2025
Published online:
5
May
2025
Gd0.7Ca0.3MnO3 and Gd0.67Ca0.33MnO3 ceramics have been synthesized by solid-state reaction method at 950 °C. Crystalline nature and orthorhombic structure have been confirmed from the XRD analysis. Loosely packed grains of different shapes with small amount of porosity are observed from the SEM analysis. The room temperature dielectric constant of Gd0.7Ca0.3MnO3 and Gd0.67Ca0.33MnO3 samples are found to be 4775 and 318 with a dielectric loss factor of 1.48 and 2.40, respectively, at 1 kHz frequency. The observed room temperature dielectric constant value of Gd0.7Ca0.3MnO3 is quite higher as compared to the dielectric constant values of substituted GdMnO3 reported in the previous literatures. The observation of these dielectric values at room temperature with low dielectric loss factor makes both the materials suitable for applications in memory storage devices. Non-Debye type of relaxation mechanism has been confirmed from the impedance and modulus analysis. The optical energy band gap of Gd0.7Ca0.3MnO3 and Gd0.67Ca0.33MnO3 is found to be 3.1 eV and 2.89 eV, respectively.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
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.
