Improving thermoelectric properties of Ca 3 Co 4 O 9+d through both Na doping and K addition at optimal values

Özkurt, B. ; Aytekin, M.E. ; Madre, M.A. (Universidad de Zaragoza) ; Sotelo, A. (Universidad de Zaragoza) ; Torres, M.A. (Universidad de Zaragoza)

Resumen: Ca 2.93 Na 0.07 Co 4 O y /x wt% K 2 CO 3 (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 Ca 3 Co 4 O 9 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 Ca 3 Co 4 O 9 ceramics can be improved significantly by both, Na doping and K addition at their optimal values. The effect of dopants on thermoelectric properties of Ca 3 Co 4 O 9 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.

Idioma: Inglés

DOI: 10.1007/s10854-019-01209-z

Año: 2019

Publicado en: Journal of Materials Science: Materials in Electronics 30 (2019), 8832 - 8837
ISSN: 0957-4522

Factor impacto JCR: 2.22 (2019)

Categ. JCR: PHYSICS, APPLIED rank: 74 / 154 = 0.481 (2019) - Q2 - T2
Categ. JCR: ENGINEERING, ELECTRICAL & ELECTRONIC rank: 132 / 265 = 0.498 (2019) - Q2 - T2
Categ. JCR: PHYSICS, CONDENSED MATTER rank: 37 / 69 = 0.536 (2019) - Q3 - T2
Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 176 / 314 = 0.561 (2019) - Q3 - T2

Factor impacto SCIMAGO: 0.477 - Electronic, Optical and Magnetic Materials (Q2) - Electrical and Electronic Engineering (Q2) - Atomic and Molecular Physics, and Optics (Q2) - Condensed Matter Physics (Q2) - Biophysics (Q3) - Biomaterials (Q3) - Bioengineering (Q3) - Biomedical Engineering (Q3)

Financiación: info:eu-repo/grantAgreement/ES/DGA-FEDER/T54-17R
Financiación: info:eu-repo/grantAgreement/ES/MINECO-FEDER/MAT2017-82183-C3-1-R

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Expresión Gráfica en Ing. (Dpto. Ingeniería Diseño Fabri.)
Área (Departamento): Área Cienc.Mater. Ingen.Metal. (Dpto. Ciencia Tecnol.Mater.Fl.)