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Composition-dependent tunability of thermoelectric properties at low temperature for Pr-doped LPFCO double perovskite

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Abstract

The current research focuses on the synthesis, characterization, and low temperature thermoelectric characteristics along with optical bandgap analysis of La2−xPrxFeCoO6 (x = 0, 0.25, 0.50, 0.75, and 1) double perovskite. The sintered sample’s crystal structure, microstructural features, electrical properties, and thermal transport parameters were examined. The nanocrystalline single-phase material was confirmed after 6 h of sintering, and the crystallite size increases with increasing Pr concentration along with the occurrences of various oxidation states of La, Pr, Fe, Co, and O. The conductivity analysis confirms the presence of a closest neighbor hopping charge carrier conduction mechanism due to decreased bandgap in entire samples. For all the compositions (x), conductivity, power factor, and figure of merit were increased with increasing temperature and Pr-content, confirming the presence of larger charge carrier concentration along with decreased bandgap. Positive S values indicate the presence of p-type charge carriers in LPFCO double perovskite and intrinsic behavior was conserved with increasing Pr-doping concentration (x). The highest Figure of Merit (ZT =  ~ 0.007) was observed for the LaPrFeCoO6 compound at 300 K. The observed results of ZT and their narrow optical bandgap suggested that, at ambient temperature, the LaPrFeCoO6 compound can be also a good choice for solar cells, sensors, bolometers, and other optoelectronic devices as well.

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Acknowledgements

The authors are very much thankful to MANIT, Bhopal, Madhya Pradesh, India (462003), for providing experimental/laboratory support while carrying out this work. Also, we wish to express our special gratitude to Dr. Sunderlal Pal, Assistant professor, Chemical Engineering Department, MANIT Bhopal for providing their valuable suggestions, and kind support throughout.

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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Authors and Affiliations

  1. Department of Materials and Metallurgical Engineering, Maulana Azad National Institute of Technology, Bhopal, M.P, 462003, India

    Lav Kush, Sanjay Srivastava & C. Sasikumar

  2. Department of Metallurgical and Material Engineering, National Institute of Technology, Jamshedpur, Jharkhand, 831014, India

    Sanjay Kumar Vajpai

  3. Process and Product Development Centre (PPDC), Agra, U.P, 282006, India

    Yogesh Srivastava

  4. Chemical Engineering Department, Faculty of Technology, Dharmsinh Desai University, Nadiad, Gujarat, 387001, India

    Yash Jaiswal

  5. MANIT, Bhopal, 462003, India

    Lav Kush

  6. Ambedkar Nagar, Rakba, Uttar Pradesh, 224145, India

    Lav Kush

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Contributions

LK contributed to the study conception and design. Material preparation, data collection and analysis were performed by LK, SS, CS, SKV and YS. The first draft of the manuscript was written by LK and critical revision on previous versions of the manuscript was carried out by all authors. All authors read and approved the final manuscript.

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Correspondence to Lav Kush.

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Kush, L., Srivastava, S., Sasikumar, C. et al. Composition-dependent tunability of thermoelectric properties at low temperature for Pr-doped LPFCO double perovskite. J Mater Sci: Mater Electron 33, 17535–17550 (2022). https://doi.org/10.1007/s10854-022-08616-9

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