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Thermoelectric properties and microstructure of large-grain Mg2Sn doped with Ag

Published online by Cambridge University Press:  31 January 2011

Haiyan Chen  and
Nick Savvides
Haiyan Chen
Affiliation:
Haiyan.Chen@csiro.auhaiyanzju@hotmail.com, CSIRO, Materials Science & Engineering, Sydney, New South Wales, Australia
Nick Savvides
Affiliation:
Nick.Savvides@csiro.au, CSIRO, Materials Science & Engineering, Sydney, New South Wales, Australia
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Abstract

Mg2Sn ingots, doped p-type by the addition of 0–1.0 at. % Ag, were prepared by the vertical Bridgman method at growth rates ∼0.1 mm/min. The crystalline quality and microstructure of ingots were analyzed by X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy. The single-phase Mg2Sn ingots consist of highly oriented large grains. Measurements of the Hall coefficient, Seebeck coefficient α, and electrical conductivity σ in the temperature range 80–700 K were conducted to study the dependence on the silver content, and to determine the thermoelectric power factor α2σ which reached a maximum value 2.4×10-3 W m-1 K-2 at 410 K for 1.0 at.% Ag content.

Keywords

thermoelectricmicrostructurecrystalline
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1166: Symposium N – Materials and Devices for Thermal-to-Electric Energy Conversion , 2009 , 1166-N03-26
Copyright
Copyright © Materials Research Society 2009

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