期刊
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
卷 259, 期 9, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssb.202100602
关键词
Heusler alloys; local structure; Ta-doped Fe2VAl; X-ray absorption fine structure; X-ray diffraction
资金
- JSPS KAKENHI [18K04748, 20K05060]
- Hibi Science Foundation
- Foundation of public interest of Tatemasu, and Transformative Research Areas (A) Hyper-Ordered Structures Science [20H05878, 20H05881]
- Grants-in-Aid for Scientific Research [18K04748, 20K05060] Funding Source: KAKEN
The local structure around doping Ta atoms in Fe2V1-xTaxAl alloys was investigated using XAFS and SR-XRD measurements. It was found that the doped Ta atoms caused local strain in the alloy. The reduction in thermal conductivity in Fe2V1-xTaxAl alloys due to Ta doping was attributed to the increased average atomic mass with the heavy element Ta and the existence of local strain.
The local structure around doping Ta atoms in Fe2V1-xTaxAl alloys is investigated using X-ray absorption fine-structure (XAFS) and synchrotron radiation X-ray diffraction (SR-XRD) measurements to elucidate the origin of the reduction in their thermal conductivity. XAFS and SR-XRD results show that with the substitution of Ta atoms at the V site, local strain exists around the doped Ta atoms. The reduction in the thermal conductivity due to Ta doping in the Fe2V1-xTaxAl alloys is attributed to the increase in the average atomic mass substituted with the heavy element Ta as well as the existence of the local strain.
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