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Transport properties of the layered Zintl compound SrZnSb2
J. Appl. Phys. 106, 013706 (2009); doi:10.1063/1.3158553
Published 9 July 2009
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Transport properties of the layered Zintl compound SrZnSb2 have been characterized from room temperature to 725 K on polycrystalline samples. SrZnSb2 samples were found to be p-type with a Hall carrier concentration of 5×1020 cm−3 at room temperature, and a small Seebeck coefficient and electrical resistivity are observed. A single band model predicts that, even with optimal doping, significant thermoelectric performance will not be achieved in SrZnSb2. A relatively low lattice thermal conductivity is observed, 
L~1.2 W m−1 K−1, at room temperature. The thermal transport of SrZnSb2 is compared to that of the layered Zintl compounds AZn2Sb2 (A=Ca,Yb,Sr,Eu), which have smaller unit cells and larger lattice thermal conductivity, L~2 W m−1 K−1, at 300 K. Ultrasonic measurements, in combination with kinetic theory and the estimated L values, suggest that the lower L of SrZnSb2 is primarily the result of a reduction in the volumetric specific heat of the acoustic phonons due to the increased number of atoms per unit cell. Therefore, this work recommends that unit cell size should be considered when selecting Zintl compounds for potential thermoelectric application.
©2009 American Institute of Physics
L~1.2 W m−1 K−1, at room temperature. The thermal transport of SrZnSb2 is compared to that of the layered Zintl compounds AZn2Sb2 (A=Ca,Yb,Sr,Eu), which have smaller unit cells and larger lattice thermal conductivity, L~2 W m−1 K−1, at 300 K. Ultrasonic measurements, in combination with kinetic theory and the estimated L values, suggest that the lower L of SrZnSb2 is primarily the result of a reduction in the volumetric specific heat of the acoustic phonons due to the increased number of atoms per unit cell. Therefore, this work recommends that unit cell size should be considered when selecting Zintl compounds for potential thermoelectric application.
©2009 American Institute of Physics
| History: | Received 16 April 2009; accepted 30 May 2009; published 9 July 2009 |
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http://link.aip.org/link/?JAPIAU/106/013706/1 |
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BibSonomy
KEYWORDS and PACS
antimony alloys,
carrier density,
electrical resistivity,
Hall effect,
phonons,
Seebeck effect,
specific heat,
strontium alloys,
thermal conductivity,
zinc alloys
- 72.15.Gd
Galvanomagnetic and other magnetotransport effects (metals/alloys) - 72.15.Jf
Thermoelectric and thermomagnetic effects (metals/alloys) - 72.15.Eb
Electrical and thermal conduction in crystalline metals and alloys - 63.20.-e
Phonons in crystal lattices - 65.40.Ba
Heat capacity of crystalline solids - YEAR: 2009
RELATED DATABASES
PUBLICATION DATA
0021-8979 (print)
1089-7550 (online)
AIP
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