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    Local Structure of Heusler-Type Fe2V1-XTaXAl Thermoelectric Materials Studied by X-Ray Absorption Fine-Structure Spectroscopy
    (Wiley-V C H Verlag Gmbh, 2022) Takahashi, Kouki; Miyazaki, Hidetoshi; Kimura, Koji; Ozkendir, Osman Murat; Nishino, Yoichi; Hayashi, Kouichi
    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.