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Structural, transport, and thermoelectric properties of electron beam-irradiated Bi1.2Pb0.33Sr1.54Ca2.06Co3Oy cobalties

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Abstract

Electron beam (EB) irradiation has been extensively studied as a tool for tailoring the structural and electrical properties of a material. In this work, the influence of EB irradiation on the structural and transport properties of p-type thermoelectric \({\mathrm{Bi}}_{1.2}{\mathrm{Pb}}_{0.33}{\mathrm{Sr}}_{1.54}{\mathrm{Ca}}_{2.06}{\mathrm{Co}}_{3}{\mathrm{O}}_{y}\) misfit cobalties has been investigated. The EB doses range from 10 to 50 \(\mathrm{kGy}\). The X-ray diffraction patterns are analysed using Rietveld refinement, which revealed that pristine and irradiated samples possess a misfit-layered crystal structure composed of two monoclinic subsystems with different b-axis lengths. The EB irradiation caused the modification in lattice parameters, resulting in a moderate increase in misfitness (b1/b2) in the structures. Furthermore, the increase in EB irradiation dosages led to decreases in resistivity and an increase in the Seebeck coefficient, which can be attributed to the misfitness (b1/b2). The highest power factor is noted in the \(50\mathrm{ kGy}\)  EB-irradiated sample possessing a value of 284.51 µW/mK2 at  \(224\mathrm{K}\) and may be considered a promising material for thermoelectric device applications.

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Acknowledgements

This work is partially supported by financial grants from Science and Engineering Research Board-DST (EMR/2016/005424), New Delhi, India, and UGC-DAE- Consortium for Scientific Research, Indore centre (CSR-IC/CRS-89/2014- 2019) and its support as a user facility. SPR is indebted to the Maharaja Institute of Technology and Maharaja Research Foundation® (MRF) for a Research Fellowship and necessary support for the work via the Shodhana Research Scheme. We gratefully acknowledge eminent scientists and engineers; Dr Mukul Gupta and Layanta Behera for XRD; Dr Rajeev Rawat and Mr Sachin Kumar (MTC lab) for electrical measurements, Dr V. G. Sathe and Mr Ajay Rathore for Raman spectroscopy, Dr. D M Phase and Vinay K Ahire for SEM and EDS at UGC-DAE Consortium for Scientific Research, Indore.

Funding

This work is partially supported by Science and Engineering Research Board (IN), EMR/2016/005424, Vijaylakshmi Dayal.

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  1. Department of Physics, Maharaja Institute of Technology Mysore (Aff. VTU Belagavi), Mandya, Karnataka, 571 477, India

    Sushmitha P. Rao, Ajay Kumar Saw & Vijaylakshmi Dayal

  2. UGC DAE Consortium for Scientific Research, University Campus, Indore, MP, 452001, India

    Chanderbhan Chotia & Gunadhor Okram

  3. Industrial Accelerator Division, Raja Ramanna Centre for Advanced Technology, Indore, MP, 452012, India

    Vijay Pal Verma, V. C. Petwal & Jishnu Dwivedi

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SPR has been involved in the visualization, conceptualization, experiments, and drafting of the manuscript. AKS was involved in experimentation. CC, VPV, VCP, JD, and GO facilitated the experiments. VD has been engaged in visualization conceptualization, experiments, and writing (reviewing and editing) to improve the overall quality of the manuscript, supervision, and project administration.

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Rao, S.P., Saw, A.K., Chotia, C. et al. Structural, transport, and thermoelectric properties of electron beam-irradiated Bi1.2Pb0.33Sr1.54Ca2.06Co3Oy cobalties. J Mater Sci: Mater Electron 34, 548 (2023). https://doi.org/10.1007/s10854-023-09926-2

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