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<p>This study investigates the structural, microstructural, and thermoelectric properties of Cr-substituted Ca<sub>0.99</sub>Ce<sub>0.01</sub>Mn<sub>1-x</sub>Cr<sub>x</sub>O<sub>3</sub> materials synthesized via solid-state reaction method. X-ray diffraction (<i>XRD</i>) analysis confirms the single-phase orthorhombic structure (<i>Pnma</i> space group) for all compositions, with successful incorporation of Cr into the crystal structure. A slight decrease in lattice parameters is observed, attributed to the smaller ionic radius of Cr<sup>3+</sup> compared to Mn<sup>3+</sup>. Field Emission scanning electron microscope (FESEM) reveals that Cr doping inhibits grain growth and induces crack formation, which significantly impacts electrical resistivity. The charge transport mechanism is well-described by Mott’s adiabatic small polaron model, with activation energy increasing with Cr doping. The Seebeck coefficient remains negative across all temperatures, indicating n-type conduction, and the highest power factor (∼0.35 mW/K<sup>2</sup>m) is achieved for the 0.03Cr-doped sample at 800&#xa0;°C. These results highlight the potential of Cr-doped CaMnO<sub>3</sub> as a cost-effective and scalable thermoelectric material, with performance comparable to that reported using more complex synthesis methods.</p>

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Insights into the Structural, Microstructural and Thermoelectric Properties of Ce/Cr co-doped CaMnO3 manganites

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月12日

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  • L. Korkmaz,
  • C. Özçelik,
  • M. Gürsul,
  • M. A. Torres,
  • M. A. Madre,
  • A. Sotelo,
  • B. Özçelik

摘要

This study investigates the structural, microstructural, and thermoelectric properties of Cr-substituted Ca0.99Ce0.01Mn1-xCrxO3 materials synthesized via solid-state reaction method. X-ray diffraction (XRD) analysis confirms the single-phase orthorhombic structure (Pnma space group) for all compositions, with successful incorporation of Cr into the crystal structure. A slight decrease in lattice parameters is observed, attributed to the smaller ionic radius of Cr3+ compared to Mn3+. Field Emission scanning electron microscope (FESEM) reveals that Cr doping inhibits grain growth and induces crack formation, which significantly impacts electrical resistivity. The charge transport mechanism is well-described by Mott’s adiabatic small polaron model, with activation energy increasing with Cr doping. The Seebeck coefficient remains negative across all temperatures, indicating n-type conduction, and the highest power factor (∼0.35 mW/K2m) is achieved for the 0.03Cr-doped sample at 800 °C. These results highlight the potential of Cr-doped CaMnO3 as a cost-effective and scalable thermoelectric material, with performance comparable to that reported using more complex synthesis methods.