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A Thermoelectric Zintl Phase Na 2+ x Ga 2+ x Sn 4– x with Disordered Na Atoms in Helical Tunnels
Author(s) -
Yamada Takahiro,
Yamane Hisanori,
Nagai Hideaki
Publication year - 2015
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201501970
Subject(s) - materials science , crystallite , dimensionless quantity , thermoelectric effect , zintl phase , phase (matter) , crystallography , figure of merit , crystal structure , thermal conductivity , analytical chemistry (journal) , condensed matter physics , thermodynamics , physics , metallurgy , chemistry , chromatography , quantum mechanics , optoelectronics , composite material
A polycrystalline sample of Na 2+ x Ga 2+ x Sn 4– 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 Bi 2 Te 3 ‐based materials.