Enhanced thermoelectric properties of bulk TiNiSn via formation of a TiNi 2Sn second phase

Jason E. Douglas, Christina S. Birkel, Mao Sheng Miao, Chris J. Torbet, Galen D. Stucky, Tresa M. Pollock, Ram Seshadri

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Abstract

The effect of phase-segregated Heusler TiNi 2 Sn on high temperature thermoelectric properties of bulk half-Heusler TiNiSn has been studied. In samples expressed by the composition TiNi 1+x Sn, a significant decrease in thermal conductivity (between 10% and 30%) is observed for two-phase TiNi 1.15 Sn, despite the second-phase particles existing at the micrometer scale; a 50 increase in the electrical conductivity is also measured. These result in a maximum figure of merit, ZT, of 0.44 at 800 K, which is 25% greater than is observed for the x = 0 sample. Density functional calculations of TiNiSn and TiNi 2 Sn suggest that the latter should deplete carriers at 0 K.

Original languageEnglish (US)
Article number183902
JournalApplied Physics Letters
Volume101
Issue number18
DOIs
StatePublished - Oct 29 2012
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Douglas, J. E., Birkel, C. S., Miao, M. S., Torbet, C. J., Stucky, G. D., Pollock, T. M., & Seshadri, R. (2012). Enhanced thermoelectric properties of bulk TiNiSn via formation of a TiNi 2Sn second phase. Applied Physics Letters, 101(18), [183902]. https://doi.org/10.1063/1.4765358