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

Korkmaz L., Özçelik C., GÜRSUL M., Torres M., Madre M., Sotelo A., ...Daha Fazla

Journal of Materials Science: Materials in Electronics, cilt.36, sa.16, 2025 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 36 Sayı: 16
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1007/s10854-025-15116-z
  • Dergi Adı: Journal of Materials Science: Materials in Electronics
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Applied Science & Technology Source, Chemical Abstracts Core, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, MEDLINE, Metadex, Civil Engineering Abstracts
  • Çukurova Üniversitesi Adresli: Evet

Özet

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.