A Thermoelectric Zintl Phase Na2+xGa2+xSn4-x with Disordered Na Atoms in Helical Tunnels

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21 Citations (Scopus)


A polycrystalline sample of Na2+xGa2+xSn4-x with x = 0.19 has low thermal conductivities of 0.56 and 0.58 W m-1 K-1 due to static and dynamic positional disorder of Na atoms in the crystal structure and dimensionless figures of merit (ZT values) values of 0.98 and 1.28 at 295 and 340 K, respectively. The performance is comparable to those of commercial Bi2Te3-based materials.

Original languageEnglish
Pages (from-to)4708-4713
Number of pages6
JournalAdvanced Materials
Issue number32
Publication statusPublished - 2015 Aug 1


  • Zintl phase
  • crystal structures
  • rattling
  • thermoelectric materials

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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