Ge-Doped ZnSb/β-Zn4Sb3 Nanocomposites with High Thermoelectric Performance
Ostovari Moghaddam, Ahmad (K. N. Toosi University of Technology)
Shokuhfar, Ali (K. N. Toosi University of Technology)
Zhang, Yu (Institut de Recerca en Energia de Catalunya)
Zhang, Ting (Institut Català de Nanociència i Nanotecnologia)
Cadavid, Doris (Universidad Nacional de Colombia. Departamento de Física)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Cabot, Andreu (Institut de Recerca en Energia de Catalunya)

Data:	2019
Resum:	ZnSb/β-ZnSb nanocomposites are produced from Zn GeSb mixtures using a two-step process. First, proper amounts of the three elements are mixed, melted, and reacted at 800 K. During this process, the nonstoichiometric mixture is crystallized in a combination of ZnSb and β-ZnSb phases. Then, the material is ball milled and subsequently hot pressed. Through this process, a dense ZnSb/β-ZnSb composite, consisting of β-ZnSb nanoinclusions embedded within a ZnSb matrix, is formed. The particular phase distribution of the final ZnSb/β-ZnSb composites is a consequence of the harder and more brittle nature of ZnSb than ZnSb, which translates into a stronger reduction of the size of the ZnSb crystal domains during ball milling. This small particle size and the high temperature generated during ball milling result in the melting of the ZnSb phase and the posterior crystallization of the two phases in a ZnSb/β-ZnSb matrix/nanoinclusion-type phase distribution. This particular phase distribution and the presence of Ge result in excellent thermoelectric performances, with power factors up to 1. 5 mW m K, lattice thermal conductivities down to 0. 74 W m K, and a thermoelectric figures of merit, ZT, up to 1. 2 at 650 K, which is among the highest ZT values reported for ZnSb.
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Matèria:	Ball milling ; Nanocomposites ; Thermoelectric ; ZnSb ; β-Zn4Sb3
Publicat a:	Advanced materials interfaces, Vol. 6, Issue 18 (September 2019) , art. 1900467, ISSN 2196-7350

DOI: 10.1002/admi.201900467

Preprint 29 p, 1.9 MB

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