Journal
APPLIED PHYSICS LETTERS
Volume 97, Issue 9, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3485050
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- Triangle de la Physique [STP 2008-095T]
- International Cooperation Department of Universite Paris-Sud XI
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p-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 x 10(4) 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 mu W 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. (C) 2010 American Institute of Physics. [doi:10.1063/1.3485050]
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