UNIDEF 23986
UNIDAD DE INVESTIGACION Y DESARROLLO ESTRATEGICO PARA LA DEFENSA
Unidad Ejecutora - UE
artículos
Título:
High-temperature thermoelectric properties of W-substituted CaMnO 3
Autor/es:
DIMAS S. ALFARUQ; JAMES EILERTSEN; PHILIPP THIEL; MYRIAM H. AGUIRRE; EUGENIO HERNÁN OTAL; SASCHA POPULOH; ANKE WEIDENKAFF
Revista:
MATERIALS RESEARCH SOCIETY SYMPOSIA PROCEEDINGS
Editorial:
Cambridge University Press
Referencias:
Año: 2013 vol. 1490 p. 3 - 8
ISSN:
0272-9172
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.
