Experimental study and thermodynamic re-assessment of the Co–Sb system

0532964 - ÚFM 2021 RIV GB eng J - Journal Article
Brož, P. - Zelenka, F. - Vřešťál, J. - Zemanová, Adéla - Kroupa, Aleš - Buršík, Jiří - Svoboda, Milan - Šimoníková, L. - Pokorný, T.
Experimental study and thermodynamic re-assessment of the Co–Sb system.
Calphad - Computer Coupling of Phase Diagrams and Thermochemistry. Roč. 68, MAR (2020), č. článku 101694. ISSN 0364-5916. E-ISSN 1873-2984
R&D Projects: GA ČR(CZ) GA17-12844S; GA MŠMT(CZ) LQ1601
Institutional support: RVO:68081723
Keywords : Co-Sb system * differential thermal analysis * phase analysis
OECD category: Thermodynamics
Impact factor: 2.017, year: 2020
Method of publishing: Open access
https://www.sciencedirect.com/science/article/pii/S0364591619302561?via%3Dihub

Abstract
The Co-Sb system is of a special attention due to existence of CoSb3 skutterudite structure which is the key structure for doped skutterudite based thermoelectric materials. A critical review of this system, performed recently, shows the published thermodynamic assessment may not be fully correct compared to existing studies. Especially, there is a contradiction in the position of the liquidus line on the Sb-rich side of the phase diagram and of the eutectic reaction, liquid - CoSb3 (Sb). As these data are crucial for the study of thermal stability of skutterudite based thermoelectric materials, a good knowledge on phase relations in the Sb-rich part of the Co-Sb phase diagram is needed. To obtain reliable data, experimental alloys covering 80 to 100 at.% of Sb were prepared and investigated by differential thermal analysis and phase analysis. The data were compared with existing literature information and thermodynamic re-assessment of this binary system based on the CALPHAD approach was done.
Permanent Link: http://hdl.handle.net/11104/0311500