Study of thermal stability of CoSb3 skutterudite by Knudsen effusion mass spectrometry

0509642 - ÚFM 2020 RIV GB eng J - Článek v odborném periodiku
Brož, P. - Zelenka, F. - Kohoutek, Z. - Vřešťál, J. - Vykoukal, V. - Buršík, Jiří - Zemanová, Adéla - Rogl, G. - Rogl, P.
Study of thermal stability of CoSb3 skutterudite by Knudsen effusion mass spectrometry.
Calphad - Computer Coupling of Phase Diagrams and Thermochemistry. Roč. 65, JUN (2019), s. 1-7. ISSN 0364-5916. E-ISSN 1873-2984
Grant CEP: GA ČR(CZ) GA17-12844S; GA MŠMT(CZ) LQ1601
Institucionální podpora: RVO:68081723
Klíčová slova: thermoelectrics * Co-Sb system * stability
Obor OECD: Thermodynamics
Impakt faktor: 1.947, rok: 2019
Způsob publikování: Omezený přístup
https://www.sciencedirect.com/science/article/pii/S0364591618302451?via%3Dihub

Thermoelectric materials play an important role in the field of renewable energy for their ability of thermal energy conversion into electricity (thermoelectric generator) and reversibly electric energy conversion into thermal energy (thermoelectric heat pump or Peltier cooling). Doped CoSb3 based skutterudites represent one of the very promising categories for the development of highly efficient thermoelectric materials for the conversion of waste heat to electricity. The thermoelectric efficiency, however, is closely related to thermal and phase stability as the current materials contain volatile elements (Sb, Sr, Yb, etc.), which can evaporate at operation conditions and thus cause structure changes and damage the thermoelectric properties. For a better understanding of the thermal behaviour of complex multicomponent CoSb3 based skutterudite systems, a study of the thermal stability of primary CoSb3 skutterudite is necessary.

In this work, the thermal and phase stability of primary CoSb3 skutterudite prepared by ball milling and hot pressing was investigated using thermal analysis and Knudsen effusion mass spectrometry performed on a Netzsch STA 409 CD/3/403/5/G apparatus, a specially-adapted type of the commercial STA 409 CD - QMS 403/5 Skimmer Coupling Instrument. Results, including data on phase transformations and those from vapour pressure measurements of antimony, supported by measurements of diffusion profiles and microstructure observations are summarized and used for evaluation of the long term thermal stability of the material.
Trvalý link: http://hdl.handle.net/11104/0300680