Processing and Thermoelectric Properties of New Si-/ Se-/ Sn-Based Intermetallics

Abstract:

Global warming is the driving force for developing new functional thermoelectric generators based on new materials which contain at least one of the elements Si, Se, or Sn. We describe four processing methods and their characterization by SEM and thermoelectric properties. The earth-abundant Mg₂Si requires the method of cyclic hydrogen loading, which has two advantages: It suppresses the oxide formation, and promotes the driving force for formation of the intermetallic phase. While the clathrate BaCuSi and the Half-Heusler alloy (TiZr)NiSn, as most intermetallic alloys, can economically be produced by arc-melting, the Se-alloys CuTiSe and CuFeSe need to be processed by the powder-in-tube method and their Seebeck-voltage measurements up to +/- 0.04 mV/K and output power of 4 μW at ΔT= 400 K are reported here for the first time.

• Periodical: Materials Science Forum (Volume 879)
• Pages: 2131-2137
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.879.2131
• Online since: November 2016
• Authors: Wilfried Wunderlich*, Masashi Sato, Yoshihito Matsumura
• Keywords: Cyclic Hydrogen Loading, Functional Metals, Powder-in-Tube, Processing, Thermoelectric Materials

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