Molten-salt synthesis of manganese-doped intermetallic TiFexMn(1−x) nanoparticles from oxide precursors

Yasukazu Kobayashi*, Shohei Yamaoka, Shinichiro Nakagawa, Nobuko Hanada

*この研究の対応する著者

研究成果: Article査読

抄録

Manganese-doped intermetallic TiFexMn(1−x) nanoparticles (NPs) were synthesized by a molten-salt synthesis method using TiO2, FeSO4•7H2O, and Mn(NO3)2•6H2O as the raw materials. The Ti–Fe–Mn oxide precursors prepared from the raw materials were efficiently reduced at temperatures as low as 600 °C in molten LiCl in the presence of CaH2 as the reducing agent. This resulted in the formation of TiFexMn(1−x) NPs exhibiting few impurities (e.g., TiFe2 or/and TiFe39). Increase in the Mn content led to peak shifts in the X-ray diffraction (XRD) patterns, indicating good incorporation of Mn into the cubic CsCl-type structure of intermetallic TiFe to form a solid solution. Nano-sized particles of< 100 nm were clearly observed in the obtained powders by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Moreover, homogeneous distribution of the constituent elements (i.e., Ti, Fe, and Mn) was confirmed by energy dispersive X-ray (EDX) spectroscopy. Finally, the hydrogen absorption properties of the prepared TiFe0.7Mn0.3 NPs were analyzed. Notably, with the exception of micron-sized TiFe0.7Mn0.3 prepared by common arc melting, the generated NPs exhibited almost no hydrogen absorption. The results obtained herein demonstrated the importance of particle size in activating TiFe-based hydrogen absorption materials.

本文言語English
論文番号168996
ジャーナルJournal of Alloys and Compounds
941
DOI
出版ステータスPublished - 2023 4月 25

ASJC Scopus subject areas

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

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