Phase formation and thermoelectric properties of Zn1+xSb binary system
Ostovari Moghaddam, Ahmad (South Ural State University. Department of Materials Science, Physical and Chemical Properties of Materials)
Trofimov, Evgeny (South Ural State University. Department of Materials Science, Physical and Chemical Properties of Materials)
Zhang, Ting (Institut Català de Nanociència i Nanotecnologia)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Cabot, Andreu (Institució Catalana de Recerca i Estudis Avançats)

Data:	2021
Resum:	The phase formation and thermoelectric (TE) properties in the central region of the Zn−Sb phase diagram were analyzed through synthesizing a series of ZnSb (x=0, 0. 05, 0. 1, 0. 15, 0. 25, 0. 3) materials by reacting Zn and Sb powders below the solidus line of the Zn−Sb binary phase diagram followed by furnace cooling. In this process, the nonstoichiometric powder blend crystallized in a combination of ZnSb and β-ZnSb phases. Then, the materials were ground and hot pressed to form dense ZnSb/β-ZnSb composites. No traces of Sb and Zn elements or other phases were revealed by X-ray diffraction, high resolution transmission electron microscopy and electron energy loss spectroscopy analyses. The thermoelectric properties of all materials could be rationalized as a combination of the thermoelectric behavior of ZnSb and β-ZnSb phases, which were dominated by the main phase in each sample. ZnSb composite exhibited the best thermoelectric performance. It was also found that Ge doping substantially increased the Seebeck coefficient of ZnSb and led to significantly higher power factor, up to 1. 51 mW·m·K at 540 K. Overall, an exceptional and stable TE figure of merit (Z) of 1. 17 at 650 K was obtained for ZnGeSb.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Zn1+xSb ; ZnSb/β-Zn4Sb3 composite ; Thermal stability ; Thermoelectric properties
Publicat a:	Transactions of Nonferrous Metals Society of China (English Edition), Vol. 31, issue 3 (March 2021) , p. 753-763, ISSN 2210-3384

DOI: 10.1016/S1003-6326(21)65536-X

11 p, 3.1 MB

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