Open AccessHigh thermoelectric performance of Cu substituted type-VIII clathrate Ba8Ga16–xCuxSn30 single crystals
Author(s) -
Shukang Deng,
Yuta Saiga,
Kousuke Kajisa,
T. Takabatake
Publication year - 2011
Publication title -
journal of applied physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.699
H-Index - 319
eISSN - 1089-7550
pISSN - 0021-8979
DOI - 10.1063/1.3583570
Subject(s) - electrical resistivity and conductivity , seebeck coefficient , thermoelectric effect , clathrate hydrate , figure of merit , analytical chemistry (journal) , dimensionless quantity , thermal conductivity , atmospheric temperature range , materials science , thermoelectric materials , condensed matter physics , chemistry , thermodynamics , hydrate , physics , optoelectronics , organic chemistry , chromatography , quantum mechanics , composite material
Single crystalline samples of type-VIII clathrate Ba8Ga 16-xCuxSn30 (0 ≤ x ≤ 0.033) were prepared by the Sn-flux method. Upon substituting Cu for Ga, the carrier mobility at 300 K increases twice while the carrier density stays in the range 3.1 - 4.2 10 19 / cm 3. Consequently, the electrical resistivity is decreased from 5.3 mωcm for x 0 to 3.2 mωcm for x 0.033. Irrespective of x, the Seebeck coefficient is largely negative and linearly changes with temperature in the range 300 < T < 600 K. The thermal conductivity is in the range 0.68 - 0.74 W/Km at 300 K for all samples. The dimensionless figure of merit ZT for x 0.033 reaches the maximum of 1.35 at 540 K. © 2011 American Institute of Physics.
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