A Thermoelectric Zintl Phase Na2+xGa2+xSn4–x with Disordered Na Atoms in Helical Tunnels. (14th July 2015)

• Record Type: Journal Article
• Authors: Yamada, Takahiro; Yamane, Hisanori; Nagai, Hideaki
• Is Part Of: Advanced materials. Volume 27:Number 32(2015)
• Page Start: 4708
• Page End: 4713
• Publication Date: 2015-07-14
• Subjects: Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.201501970
• Languages: English
• ISSNs: 0935-9648

Abstract

<abstract abstract-type="graphical" xml:lang="en" id="adma201501970-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p> <bold>A polycrystalline sample of Na_{2+<italic>x</italic>}Ga_{2+<italic>x</italic>}Sn_{4–<italic>x</italic>} with <italic>x</italic> = 0.19</bold> 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 (<italic>ZT</italic> 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. <graphic position="anchor" mimetype="image" xlink:href="ark:/27927/pgj2frx6rdb" orientation="portrait" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></p> </abstract>