Study of thermal stability of n-type skutterudites Sr0.07Ba0.07Yb0.07Co4Sb12 by differential thermal analysis and Knudsen effusion method

0543760 - ÚFM 2022 RIV GB eng J - Journal Article
Zelenka, F. - Strádal, J. - Brož, P. - Vřešťál, Jan - Buršík, Jiří - Zemanová, Adéla - Rogl, G. - Rogl, P.
Study of thermal stability of n-type skutterudites Sr0.07Ba0.07Yb0.07Co4Sb12 by differential thermal analysis and Knudsen effusion method.
Calphad - Computer Coupling of Phase Diagrams and Thermochemistry. Roč. 73, JUN (2021), č. článku 102258. ISSN 0364-5916. E-ISSN 1873-2984
R&D Projects: GA ČR(CZ) GA17-12844S; GA MŠMT(CZ) 8J19AT011
Institutional support: RVO:68081723
Keywords : instrument * yb * Thermoelectric materials * Skutterudites * Differential thermal analysis * Knudsen effusion method * Analytical scanning electron microscopy
OECD category: Audio engineering, reliability analysis
Impact factor: 2.004, year: 2021
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0364591621000092?via%3Dihub

With a high figure of merit, ZT, described in detail in the introduction, multi-filled CoSb3 skutterudites attract attention for their use as thermoelectric materials. In this work, the thermal and phase stability of n-type skutterudites, Sr0.07Ba0.07Yb0.07Co4Sb12, prepared by ball milling, hot pressing and high-pressure torsion or by combinations thereof, with ZT values of about 1.4, have been studied via differential thermal analysis and Knudsen effusion method. The results from evaporation of antimony, strontium, barium and ytterbium as the volatile elements and those from phase transformation measurements are presented. The information, supported by microstructure investigation and measurement of diffusion profiles, is summarized and the long-term operation stability of the studied bulk and nano-structured thermoelectrics is evaluated. Almost no strontium, barium and ytterbium evaporation and only a slight evaporation of antimony demonstrate a long-term operation stability of the bulk and nano-structured thermoelectrics investigated.
Permanent Link: http://hdl.handle.net/11104/0320906