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

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ZELENKA František STRÁDAL Jakub BROŽ Pavel VŘEŠŤÁL Jan BURŠÍK Jiří ZEMANOVÁ Adéla ROGL Gerda ROGL Peter

Rok publikování 2021
Druh Článek v odborném periodiku
Časopis / Zdroj Calphad
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://doi.org/10.1016/j.calphad.2021.102258
Doi http://dx.doi.org/10.1016/j.calphad.2021.102258
Klíčová slova Thermoelectric materials; Skutterudites; Differential thermal analysis; Knudsen effusion method; Analytical scanning electron microscopy
Popis 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.
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