Bi 1 − x Sr x CuSeO oxyselenides as promising thermoelectric materials
2010; American Institute of Physics; Volume: 97; Issue: 9 Linguagem: Inglês
10.1063/1.3485050
ISSN1520-8842
AutoresLi‐Dong Zhao, David Bérardan, Pei Yan-bin, Céline Byl, L. Pinsard-Gaudart, Nita Dragoe,
Tópico(s)Physics of Superconductivity and Magnetism
Resumop -type BiCuSeO, a layered oxyselenide composed of conductive (Cu2Se2)2− layers alternately stacked with insulating (Bi2O2)2+ layers, shows an enhancement of the electrical conductivity after substituting Bi3+ by Sr2+, from 470 S m−1 (BiCuSeO) to 4.8×104 S m−1 (Bi0.85Sr0.15CuSeO) at 293 K. Coupled to high Seebeck coefficients, this leads to promising values of the thermoelectric power factor that exceeds 500 μW m−1 K−2 at 873 K. Moreover, the thermal conductivity of these layered compounds is lower than 1 W m−1 K−1 at 873 K. Maximum ZT values reach 0.76 at 873 K, making this family promising for thermoelectric applications in the medium temperature range.
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