Impact of La substitution on the thermoelectric properties of polycrystalline (Bi, Pb)-2223 below room temperature
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Mohd Saif
Abstract
Polycrystalline pellets of Bi1·75Pb0·35Sr2-x La x Ca2Cu3O10 (x = 0.00, 0.02, 0.06, 0.08) have been synthesized using a solid-state reaction technique. The structural characterization carried out by X-ray diffraction confirms tetragonal phase and a shift in peak positions due to incorporation of La at Sr sites. Scanning electron micrographs reveal a decrease in grain size with La doping. The electrical resistivity data indicate a superconducting transition at about 106 K for pristine (Bi, Pb)-2223 pellet which is suppressed on La doping in Bi1·75Pb0·35Sr2-x La x Ca2Cu3O10. Apart from that an increase in resistivity and metallic to semiconducting transition has also been observed at higher La concentration (for x = 0.08). Hole-type conduction has been confirmed for each sample through thermopower measurement. The thermopower of investigated pellets has been explained in the light of various theoretical models and correlations as a function of temperature. Amongst them, the Mott–Jones model provides a satisfactory explanation of experimental result. An improvement in power factor of Bi1·75Pb0·35Sr2-x La x Ca2Cu3O10 doped with 8 wt.% of La has been observed in a specific temperature range which indicates that thermoelectric performance may be improved by optimizing La concentration.
Acknowledgments
Authors acknowledge CSTUP for providing research funding as well as INUP i2i (IIT Delhi) for providing some characterization facilities.
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Research ethics: Not applicable.
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Informed consent: Not applicable.
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Author contributions: Mohd Saif: The sample synthesis, electrical resistivity and Thermopower measurement, data analysis and draft of the manuscript were prepared by Mohd Saif. D. Tripathi: D. Tripathi provided the valuable inputs in result analysis and drafting the manuscript.
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Use of Large Language Models, AI and Machine Learning Tools: None declared.
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Conflict of interests: The authors state no conflict of interest.
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Research funding: Council of Science and Technology (CSTUP).
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Data availability: The raw data can be obtained on request from the corresponding author.
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