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@article{2379470,
author = {Rogl, Gerda and Buršíková, Vilma and Yubuta, Kunio and Murayama, Haruka and Sato, Kohei and Yamamoto, Wakaba and Yasuhara, Akira and Rogl, Peter},
article_location = {Lausanne},
article_number = {March 2024},
doi = {http://dx.doi.org/10.1016/j.jallcom.2024.173431},
keywords = {Thermoelectric material; High-pressure; Mechanical alloying; Thermal expansion; Mechanical properties; Transmission electron microscopy TEM},
language = {eng},
issn = {0925-8388},
journal = {Journal of Alloys and Compounds},
title = {In-situ observation of temperature dependent microstructural changes in HPT-produced p-type skutterudites},
url = {https://www.sciencedirect.com/science/article/pii/S0925838824000173},
volume = {977},
year = {2024}
}
TY - JOUR
ID - 2379470
AU - Rogl, Gerda - Buršíková, Vilma - Yubuta, Kunio - Murayama, Haruka - Sato, Kohei - Yamamoto, Wakaba - Yasuhara, Akira - Rogl, Peter
PY - 2024
TI - In-situ observation of temperature dependent microstructural changes in HPT-produced p-type skutterudites
JF - Journal of Alloys and Compounds
VL - 977
IS - March 2024
SP - 1-8
EP - 1-8
PB - Elsevier Science
SN - 09258388
KW - Thermoelectric material
KW - High-pressure
KW - Mechanical alloying
KW - Thermal expansion
KW - Mechanical properties
KW - Transmission electron microscopy TEM
UR - https://www.sciencedirect.com/science/article/pii/S0925838824000173
N2 - To build thermoelectric generators, leg materials with a high figure of merit, ZT, are essential. Skutterudites are promising candidates because besides being environmentally friendly, the starting material is available and cheap and they can be used in a wide temperature range. To enhance ZT, severe plastic deformation via high-pressure torsion, HPT, was successfully applied on ball-milled and hot-pressed skutterudites as well as to directly densify skutterudite powder. Severe plastic deformation introduces many defects, mainly dislocations, into the sample and in parallel the crystallite size is significantly reduced. During measurement-induced heating these defects anneal partially out, and the grains grow. It was observed that while heating HPT processed material from room temperature to about 850 K, changes of the temperature-dependent physical properties, most of all the electrical resistivity, the density, and the thermal expansion occur more or less simultaneously around 600 K. For the first time we have combined in situ TEM observations as well as in situ measurements of the elastic modulus and hardness in order to get a deeper insight into the microstructural behavior of a p-type skutterudite, DD0.7Fe3CoSb12 (DD = didymium) during increasing temperature from 300 K to 823 K. HPT-DD0.7Fe3CoSb12 is a high quality thermoelectric material with 1.2 < ZT < 1.4 at 750 K (hot-pressed reference sample: ZT ∼ 1.2 at 810 K).
ER -
ROGL, Gerda, Vilma BURŠÍKOVÁ, Kunio YUBUTA, Haruka MURAYAMA, Kohei SATO, Wakaba YAMAMOTO, Akira YASUHARA and Peter ROGL. In-situ observation of temperature dependent microstructural changes in HPT-produced p-type skutterudites. \textit{Journal of Alloys and Compounds}. Lausanne: Elsevier Science, 2024, vol.~977, March 2024, p.~1-8. ISSN~0925-8388. Available from: https://dx.doi.org/10.1016/j.jallcom.2024.173431.
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