Detail investigation of thermoelectric performance and magnetic properties of Cs-doped Bi2Sr2Co2Oy ceramic materials

Özçelik, B. ; Gürsul, M. ; Çetin, G. ; Özçelik, C. ; Torres, M.A. (Universidad de Zaragoza) ; Madre, M.A. (Universidad de Zaragoza) ; Sotelo, A. (Universidad de Zaragoza)

Resumen: Bi2Sr2-xCsxCo2Oy materials with 0 = x = 0.15, have been fabricated via the classical ceramic technique. XRD results have indicated that undoped and Cs-substituted samples are composed of Bi2Sr2Co2Oy phase as the major one. Microstructural studies have demonstrated the formation of a liquid phase, which allows a drastic grain growth. This factor is responsible for a drastic improvement of relative density, reaching about 95% of the theoretical one for 0.125 Cs content. On the other hand, electrical resistivity has been reduced up to 14 mO cm at 650 °C for 0.125 Cs content, around 40% lower than the obtained in undoped samples. As a consequence, Seebeck coefficient has been decreased due to the raise in charge carrier concentration. The highest power factor at 650 °C (0.21 mW/K2 m) has been found for 0.125 Cs substituted sample, about 40% larger than the obtained in undoped samples, and very similar to the notified in single crystals (0.26 mW/K2 m). Magnetisation with respect to temperature results have demonstrated that measured samples have a paramagnetic property above 50 K, except 0.10 Cs. Magnetic hysteresis curves have shown that the slopes and the magnitudes have increased with decreasing temperature.

Idioma: Inglés

DOI: 10.1007/s42452-020-04066-2

Año: 2021

Publicado en: SN Applied Sciences 3, 1 (2021), 114 [8 pp]
ISSN: 2523-3963

Factor impacto CITESCORE: 2.7 - Earth and Planetary Sciences (Q2) - Environmental Science (Q2) - Engineering (Q2) - Chemical Engineering (Q3) - Materials Science (Q3) - Physics and Astronomy (Q3)

Factor impacto SCIMAGO: 0.342 - Chemical Engineering (miscellaneous) (Q2) - Engineering (miscellaneous) (Q2) - Materials Science (miscellaneous) (Q2) - Physics and Astronomy (miscellaneous) (Q2) - Environmental Science (miscellaneous) (Q2)

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

Tipo y forma: Article (Published version)

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