In-situ observation of temperature dependent microstructural
changes in HPT-produced p-type skutterudites

J 2024

In-situ observation of temperature dependent microstructural changes in HPT-produced p-type skutterudites

ROGL, Gerda, Vilma BURŠÍKOVÁ, Kunio YUBUTA, Haruka MURAYAMA, Kohei SATO et. al.

Basic information

Original name

In-situ observation of temperature dependent microstructural changes in HPT-produced p-type skutterudites

Authors

ROGL, Gerda, Vilma BURŠÍKOVÁ (203 Czech Republic, belonging to the institution), Kunio YUBUTA, Haruka MURAYAMA, Kohei SATO, Wakaba YAMAMOTO, Akira YASUHARA and Peter ROGL

Edition

Journal of Alloys and Compounds, Lausanne, Elsevier Science, 2024, 0925-8388

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10403 Physical chemistry

Country of publisher

Switzerland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL

Impact factor

Impact factor: 6.200 in 2022

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.1016/j.jallcom.2024.173431

UT WoS

001157988300001

Keywords in English

Thermoelectric material; High-pressure; Mechanical alloying; Thermal expansion; Mechanical properties; Transmission electron microscopy TEM

Abstract

V originále

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).

Links

LM2023039, research and development project

Name: Centrum výzkumu a vývoje plazmatu a nanotechnologických povrchových úprav

Investor: Ministry of Education, Youth and Sports of the CR

8J21AT015, research and development project

Name: Intenzivní plastická deformace - cesta k termoelektrickým materiálům s vysokou konverzní účinností

Investor: Ministry of Education, Youth and Sports of the CR, Austria

90110, large research infrastructures

Name: CzechNanoLab

Citovat

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. 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.

@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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