Ozkurt, BerdanAytekin, M. ErsinMadre, M. A.Sotelo, A.Torres, M. A.2025-03-172025-03-1720190957-45221573-482Xhttps://doi.org/10.1007/s10854-019-01209-zhttps://hdl.handle.net/20.500.13099/2348Ca2.93Na0.07Co4Oy/x wt% K2CO3 (x=0.00, 0.01, and 0.03) polycrystalline ceramics were prepared by conventional solid-state method. XRD results have shown that all samples predominantly include Ca3Co4O9 phase together with small amounts of secondary phases. SEM images show that all samples have randomly oriented plate-like grains in different sizes. The electrical resistivity measurement showed that electrical properties of Ca3Co4O9 ceramics can be improved significantly by both, Na doping and K addition at their optimal values. The effect of dopants on thermoelectric properties of Ca3Co4O9 was examined by both, Seebeck coefficient and power factor, being higher in K-added than in the pure samples, indicating that thermoelectric properties of samples are positively affected when alkaline elements enter into their structure.eninfo:eu-repo/semantics/closedAccessAg AdditionTemperatureSubstitutionEnhancementCeramicsPerformanceImprovementCaSrLiArticle10.1007/s10854-019-01209-z30988328837Q2WOS:0004680508000752-s2.0-85064207078Q2