High-temperature thermoelectric properties of W-substituted CaMnO3

Alfaruq, Dimas S. ; Eilertsen, James ; Thiel, Philipp ; Aguirre, Myriam H (Universidad de Zaragoza) ; Otal, Eugenio ; Populoh, Sascha ; Yoon, Songhak ; Weidenkaff, Anke

Resumen: The thermoelectric properties of W-substituted CaMn1-xWxO3-δ (x = 0.01, 0.03; 0.05) samples, prepared by soft chemistry, were investigated from 300 K to 1000 K and compared to Nb-substituted CaMn0.98Nb0.02O3-δ. All compositions exhibit both an increase in absolute Seebeck coefficient and electrical resistivity with temperature. Moreover, compared to the Nb-substituted sample, the thermal conductivity of the W-substituted samples was strongly reduced. This reduction is attributed to the nearly two times greater mass of tungsten. Consequently, a ZT of 0.19 was found in CaMn0.97W0.03O3-δ at 1000 K, which was larger than ZT exhibited by the 2% Nb-doped sample.

Idioma: Inglés

DOI: 10.1557/opl.2013.85

Año: 2013

Publicado en: Materials Research Society symposia proceedings 1490 (2013), 135-140
ISSN: 0272-9172

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)