Lower temperature of the structural transition, and thermoelectric properties in Sn-substituted GeTe. (2021)

• Record Type: Journal Article
• Authors: Gainza, J.; Serrano-Sánchez, F.; Nemes, N.M.; Dura, O.J.; Martínez, J.L.; Alonso, J.A.
• Is Part Of: Materials today. Volume 44:Part 4(2021)
• Page Start: 3450
• Page End: 3457
• Publication Date: 2021
• Subjects: Germanium telluride -- X-ray synchrotron diffraction -- Structural phase transition -- Thermoelectric material -- Thermal conductivity; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2020.03.044
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: GeTe is a potential thermoelectric material for mid-temperature range applications. Here, we report on GeTe and Ge0.9 Sn0.1 Te prepared using a fast and simple arc-melting method. Their crystal structures have been analyzed by synchrotron X-ray diffraction. Calorimetry identified a shift in the rhombohedral to cubic structural transition temperature from 700 K to 557 K due to Sn alloying. Nevertheless, the temperature of the maximum Seebeck-coefficient is preserved, at 770 K. The thermoelectric properties are also reported, with a strong decrease of electric and thermal conductivities of the Sn-doped compound, as compared to the undoped one. The Hall-mobility also decreases strongly upon doping.