Insight into the impact of multi-doping on the oxygen ion transport properties of GDC-type ceramics for intermediate-temperature SOFCs
SOLID STATE COMMUNICATIONS, cilt.419, 2027 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 419
- Basım Tarihi: 2027
- Doi Numarası: 10.1016/j.ssc.2026.116631
- Dergi Adı: SOLID STATE COMMUNICATIONS
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Chimica, Compendex, INSPEC, Academic Search Ultimate (EBSCO), Engineering Source (EBSCO)
- Erciyes Üniversitesi Adresli: Evet
Özet
In this study, a gadolinium-doped ceria (GDC)-type electrolyte was co-doped with Nd3+, Eu3+, and La3+ cations, and the structural and thermo-electrical properties were specially investigated under heavy doping (>40%) conditions. The XRD patterns showed that the fcc structure was maintained below the 40% doping limit, while samples synthesized above this limit developed minor phase peaks, implying a heterogeneous phase. The crystalline size decreased with increasing doping ratio, while microstrain increased inversely. The DTA curves did not exhibit any endothermal or exothermal peaks, indicating a change in lattice symmetry. Arrhenius plots depending on temperature clearly demonstrated that ionic conductivity decreased as the doping rate increased, implying that the excess lanthanide cations could act as trapping points for mobile anions. Among all samples, the composition doped with 20%, which had the lowest doping rate, exhibited the highest conductivity at 0.022 S/cm and, as expected, had the lowest activation energy at 0.68 eV.