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Effect of A-site and B-site ion substitution on the electrical and thermoelectric properties of nanostructured perovskite CaMnO3

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Abstract

The impact of A-site and B-site ion substitution (A-site: Sr and B-site: Co) on the electrical and thermoelectric properties of the perovskite CaMnO3 nanoparticles has been investigated. The perovskite nanoparticles have been prepared by sol–gel hydrothermal method at 200 °C followed by annealing at optimum temperature.  Thermal, structural, morphological, elemental, functional, optical, electrical, and thermoelectric properties of the samples have been performed using TG-DTA analysis, powder X-ray Diffraction, Raman analysis, Scanning Electron Microscopy with Energy Dispersive X-ray Analysis, Fourier Transform Infrared Spectroscopy, UV–Vis spectroscopy, and thermoelectric measurement. Powder XRD analysis reveals the perovskite structure and the optimized annealing temperature. Surfactants reduced the average particle size which improves the thermopower. The decrease in substitution ionic size causes an increase in lattice parameters and unit cell volume. Oxygen-deficient nanoparticles were observed with symmetric Raman lines and the mesoporous structured nanoparticles enhanced the surface area leading to higher electrical conductivity. The temperature dependence thermoelectric measurement was performed between ambient temperature and 673 K. The electrical resistivity depends on the nature of substituent ions. The absolute Seebeck coefficient values for pure CaMnO3, A-site, and B-site substituted were − 312, − 287, and 98µVK−1, respectively. The systematic analysis revealed that ion substitution at the A-site and B-site influenced significant changes in the crystal structure and the type of carrier concentration.

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Data availability

The authors declare that the data supporting the findings of this study are available within this paper. Data sets generated during the current study are available from the corresponding author based on reasonable request. Data will be made available on reasonable request.

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Acknowledgements

One of the authors (Dr. S. Berbeth Mary) would like to thank UGC-DAE Consortium for Scientific Research, Indore for providing the opportunity to use the research facilities at this Centre.

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  1. Department of Physics, K. Ramakrishnan College of Engineering (Autonomous), Tiruchirappalli, Tamil Nadu, 621 112, India

    S. Berbeth Mary

  2. Department of Physics, Nandha Engineering College (Autonomous), Erode, Tamil Nadu, 638 052, India

    K. S. Mohan

  3. Department of Physics, Sona College of Technology (Autonomous), Salem, Tamil Nadu, 636 005, India

    M. Muthu Krishnan

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All authors contributed to the conceptual study of this research article. Material preparation, data collection and analysis were performed by Dr. S. Berbeth Mary, Dr. K.S. Mohan. The first draft of the manuscript was written by Dr. S. Berbeth Mary and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.Dr. M. MuthuKrishnan contributed to finding the oxygen stoichiometry and also to answering the queries of reviewers.

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Mary, S.B., Mohan, K.S. & Krishnan, M.M. Effect of A-site and B-site ion substitution on the electrical and thermoelectric properties of nanostructured perovskite CaMnO3. J Mater Sci: Mater Electron 35, 600 (2024). https://doi.org/10.1007/s10854-024-12351-8

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