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キーワード:
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要旨:
Half-Heusler (HH) and especially TiNiSn-based alloys have shown high
potential as thermoelectric (TE) materials for power generation
applications. The reported transport properties show, however, a
significant spread of results, due mainly to the difficulty in
fabricating single-phase HH samples in these multicomponent and
multiphased systems. In particular, little attention has been paid to
the influence of the various minority phases on the TE performance of
these compounds. A clear understanding of these issues is mandatory for
the design of improved and stable TE HH-based composites. This study
examines the structural and compositional influence of the residual
metallic (Sn) and intermetallic phases (mainly Ti(6)Sn(5) and the
Heusler compound TiNi(2)Sn) on the TE properties of the TiNiSn HH
compounds processed by spark plasma sintering.
