The Interplay Between Electrical Conductivity and Electronic Thermal Conductivity in Strontium Titanate Compounds for Enhanced Thermoelectric Power Generation

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@article{1722418,
      author = {Adindu C. Iyasara, John N. Nweke, Levi C. Agbo, Ibiam John Ama, Ugochukwu B. Amadi},
      title = {The Interplay Between Electrical Conductivity and Electronic Thermal Conductivity in Strontium Titanate Compounds for Enhanced Thermoelectric Power Generation},
      journal = {Iconic Research And Engineering Journals},
      year = {2026},
      volume = {10},
      number = {2},
      pages = {2140-2149},
      issn = {2456-8880},
      url = {https://www.irejournals.com/formatedpaper/1722418.pdf},
      abstract = {The thermoelectric (TE) performance of strontium titanate (SrTiO3)-based compounds is fundamentally determined by the interplay between electrical conductivity (σ) and electronic thermal conductivity (KE), two transport parameters that collectively govern charge and heat flow during thermoelectric power generation. As a chemically stable oxide with excellent thermal stability, SrTiO3 has attracted significant attention for high-temperature thermoelectric applications. However, its intrinsically low electrical conductivity limits its practical performance. This review examines how the crystal and electronic properties of SrTiO3 influence the coupling between electrical conductivity and electronic thermal conductivity and their combined impact on the thermoelectric figure of merit (ZT). Particular emphasis is placed on the Wiedemann-Franz relationship, which establishes the inherent dependence of electronic thermal conductivity on electrical conductivity, thereby presenting a major challenge in optimizing thermoelectric efficiency. The review further discusses carrier concentration optimization as a critical strategy for balancing electrical conductivity, Seebeck coefficient, S and electronic thermal conductivity to achieve superior thermoelectric performance. The influence of rare-earth (RE) dopants such as lanthanum, La and Samarium, Sm is critically evaluated with respect to their effects on carrier concentration, electronic structure, electrical conductivity, and heat transport. These dopants enhance electron transport while modifying lattice characteristics that influence thermal conduction, enabling improved TE performance when appropriately optimized. Overall, this review demonstrates that understanding and controlling the interplay between electrical conductivity and electronic thermal conductivity through crystal chemistry, carrier concentration optimization and RE doping is fundamental to the design of high-performance SrTiO3-based thermoelectric materials for efficient and sustainable high-temperature power generation.},
      keywords = {strontium titanate, electrical conductivity, electronic thermal conductivity, wiedemann-franz relationship, carrier concentration.},
      month = {August},
      doi = {https://doi.org/10.64388/IREV10I2-1722418}
  }