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Enhanced dielectric properties of Pr and Fe co-substituted La2CoMnO6

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Abstract

Double perovskite system with compositional formula LaPrCo1−xFexMnO6; (x = 0.2, 0.5, 0.8, 1.0) has been synthesized via the sol–gel technique and their dielectric properties were investigated. Impedance spectroscopy was used to evaluate various parameters such as dielectric constant, dielectric loss, ac conductivity and so on. The double perovskite system with enhanced dielectric properties has been achieved as compared to pure samples. Both dielectric constant and tan δ exhibited large values at low frequencies and took nearly constant values at higher frequencies. Dielectric constant (ε′) is observed to decrease initially with the substitution of Pr and Fe in La2CoMnO6 (LCMO) and afterwards shows increasing behaviour with increase in Fe content and is maximum for LPFMO (x = 1.0). The comparative plot of impedance and modulus confirmed that the system of samples disobeys ideal Debye type behaviour and has short-range mobility of charge carriers. Nyquist plots of impedance inveterate the decrease in bulk resistance with rise in temperature which represents typical semiconducting nature of synthesized system and depression in semicircular arcs suggested non-Debye type behaviour of prepared samples. The increase in the bulk resistance is observed with the substitution of Pr and Fe in LCMO, i.e. for LPCFMO1. But, later with increase in content of Fe, the bulk resistance is found to decrease up to x = 0.8 for LCFMO2 and LCFMO3 and then again increase for LPFMO (x = 1.0). Positive correlation has been displayed by ac conductivity for both frequency and temperature. Ac conductivity initially decreased with the substitution (Pr and Fe) and afterwards exhibited increasing trend with increase in Fe content up to LPCFMO3 (x = 0.8) and then decreased for LPFMO. Large dielectric constant and small tan δ for LPFMO at room temperature make it suitable for energy storage capacitor applications.

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Data availability

Authors state that data supporting the results of our work are present within this research paper. The raw data collected during experiments are obtainable from the corresponding author, if required, on reasonable request.

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Acknowledgements

Reena and Neelam would like to thank DCRUST, Murthal, for providing financial support under URS and TEQIP.

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Authors and Affiliations

  1. Department of Physics, Deenbandhu Chhotu Ram University of Science and Technology, Murthal, Sonepat, Haryana, 131039, India

    Reena Sharma, Neelam Hooda, Ashima Hooda & Satish Khasa

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  1. Reena Sharma
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  2. Neelam Hooda
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  3. Ashima Hooda
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  4. Satish Khasa
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Contributions

Reena Sharma and Neelam Hooda: conceptualization, methodology, investigation and formal analysis. Reena Sharma: writing-original draft, data curation, software and handling of manuscript. Ashima Hooda and Satish Khasa: supervision and writing-review and editing. Final manuscript has been read and approved by all authors.

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Correspondence to Ashima Hooda.

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Sharma, R., Hooda, N., Hooda, A. et al. Enhanced dielectric properties of Pr and Fe co-substituted La2CoMnO6. J Mater Sci: Mater Electron 35, 257 (2024). https://doi.org/10.1007/s10854-024-11975-0

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