Improved Thermoelectric Performance Achieved by Regulating Heterogeneous Phase in Half-Heusler TiNiSn-Based Materials

Jun Liang Chen, Chengyan Liu, Lei Miao, Jie Gao, Yan yan Zheng, Xiaoyang Wang, Jiacai Lu, Mingzheng Shu

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

With excellent high-temperature stability (up to 1000 K) and favorable electrical properties for thermoelectric application, TiNiSn-based half-Heusler (HH) alloys are expected to be promising thermoelectric materials for the recovery of waste heat in the temperature ranging from 700 K to 900 K. However, their thermal conductivity is always relatively high (5–10 W/mK), making it difficult to further enhance their thermoelectric figure-of-merit (ZT). In the past decade, introducing nano-scale secondary phases into the HH alloy matrix has been proven to be feasible for optimizing the thermoelectric performance of TiNiSn. In this study, a series of TiNiSn-based alloys have been successfully synthesized by a simple solid-state reaction. The content and composition of the heterogeneous phase (TiNi2Sn and Sn) is accurately regulated and, as a result, the thermal conductivity successfully reduced from 4.9 W m−1 K−1 to 3.0 Wm−1 K−1 (750 K) due to multi-scale phonon scattering. Consequently, a ZT value of 0.49 is achieved at 750 K in our TiNiSn-based thermoelectric materials. Furthermore, the thermal stability of TiNiSn alloys is enhanced through reducing the Sn substance phase.

Original languageEnglish
Pages (from-to)3248-3253
Number of pages6
JournalJournal of Electronic Materials
Volume47
Issue number6
DOIs
Publication statusPublished - 2018 Jun 1
Externally publishedYes

Keywords

  • half-Heusler
  • heterogeneous phase
  • Thermoelectric materials
  • TiNiSn alloys

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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