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Thermal stability and thermoelectric properties of p-type Ba8Ga16Ge30 clathrates

J. Appl. Phys. 106, 074509 (2009); doi:10.1063/1.3236635

Published 9 October 2009

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D. Cederkrantz,1 A. Saramat,2 G. J. Snyder,2 and A. E. C. Palmqvist1
1Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-41296 Göteborg, Sweden
2Materials Science, California Institute of Technology, Pasadena, California 91125, USA
The thermal stability of p-type Ba8Ga16Ge30 clathrates grown from gallium flux has been tested by heat treatment in low pressure Ar atmosphere at 400, 600, and 800 °C. Significant gallium loss was observed for all samples during heat treatment. The treatment at 400 °C does not significantly change the sample properties, and the samples remain p-type and comparable to the untreated, as-prepared, sample. At 600 °C the sample switches from extrinsic p-type to extrinsic n-type, presumably due to significant loss of Ga, and shows a high thermopower but a reduced electrical conductivity compared to as-made n-type samples. Surprisingly, after a thermal treatment at 800 °C, the crystal structure seemingly loses less Ga, only reducing the hole concentration to near intrinsic levels and thus has a negative impact on ZT. Regardless of the heat treatment temperature of the p-type samples the thermal conductivity remained exceptionally low, for some samples 0.9  W/m K. Heat treatment can thus greatly affect the thermoelectric properties of p-type Ba8Ga16Ge30, but the crystal structure remains intact. ©2009 American Institute of Physics
History: Received 1 July 2009; accepted 26 August 2009; published 9 October 2009
Permalink: http://link.aip.org/link/?JAPIAU/106/074509/1
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KEYWORDS and PACS

Keywords
PACS
  • 72.20.Pa
    Thermoelectric and thermomagnetic effects (semiconductors/insulators)
  • 72.80.Jc
    Electrical conductivity of other crystalline inorganic semiconductors
  • 61.66.Fn
    Crystal structure of specific inorganic compounds
  • 81.05.Hd
    Other semiconductors: fabrication, treatment, testing and analysis
  • 81.40.Gh
    Other heat and thermomechanical treatments
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
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