Thermoelectric Properties of Arc-Melted Ba8Al16Si30 Clathrate

Abstract:

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Ba8Al16Si30 type I clathrate was produced by arc melting and thermoelectric properties were investigated. The phase transformation behavior of arc-melted type I Ba8Al16Si30 was examined by thermogravimetric analysis, differential scanning calorimetry, hardness test, density measurement, X-ray diffraction and scanning electron microscope analyses. Homogenization was carried out to induce the transformation to a thermoelectric phase at 773K to 973K for 5 hours and 24 hours in the vacuum furnace. Thermoelectric properties in the temperature range between 300K and 600K were measured and evaluated. Electrical conductivity was decreased and Seebeck coefficient was increased with increasing homogenization temperature and time. The arc-melted and the homogenized specimens represented n-type conduction at temperatures examined, and they showed reliable thermoelectric behaviors with increasing homogenization temperature and time.

Info:

Periodical:

Materials Science Forum (Volumes 539-543)

Main Theme:

Edited by:

T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran

Pages:

3309-3312

DOI:

10.4028/www.scientific.net/MSF.539-543.3309

Citation:

J. I. Lee et al., "Thermoelectric Properties of Arc-Melted Ba8Al16Si30 Clathrate", Materials Science Forum, Vols. 539-543, pp. 3309-3312, 2007

Online since:

March 2007

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Price:

$35.00

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