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Controlled Synthesis and Magnetic Properties of Uniform Hierarchical Polyhedral α-Fe2O3 Particles

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Abstract

The controlled synthesis of uniform hierarchical polyhedral iron (Fe) micro-/nanoscale oxide particles with the α-Fe2O3 structure is presented. The hierarchical polyhedral iron oxide particles were synthesized by modified polyol methods with sodium borohydride as a powerful and efficient reducing agent. A critical heat treatment process used during the synthesis allowed for the interesting formation of α-Fe2O3 hematite with a micro-/nanoscale structure. The structure and weak ferromagnetism of the α-Fe2O3 particles were investigated by x-ray diffraction with whole pattern fitting and Rietveld refinement, scanning electron microscopy, and by vibrating sample magnetometry. The as-prepared α-Fe2O3 particles and the three dimensional models presented have promising practical applications for energy storage and conversion in batteries, capacitors, and fuel cells, and related spintronic devices and technologies.

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Abbreviations

M :

Magnetization (emu g−1)

M R :

Remanence or remanent magnetization (emu g−1)

M S :

Magnetic saturation (emu g−1)

H :

Magnetic field strength (Oe)

H c :

Coercivity (Oe)

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Authors and Affiliations

  1. Ceramics and Biomaterials Research Group, Ton Duc Thang University, 19 Nguyen Huu Tho Str., Tan Phong Ward, District 7, Ho Chi Minh City, Vietnam

    Nguyen Viet Long, Yong Yang & Masayuki Nogami

  2. Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam

    Nguyen Viet Long, Yong Yang & Masayuki Nogami

  3. Toyota Physical and Chemical Research Institute, Nagakute, Aichi, Japan

    Masayuki Nogami

  4. Ho Chi Minh City University of Technology, 475A Dien Bien Phu Street, Binh Thanh District, Ho Chi Minh City, Vietnam

    Cao Minh Thi

  5. Department for Novel and Nanostructure Materials, Ho Chi Minh City Institute of Physics, Academy of Science and Technology, 01 Mac Dinh Chi St., Dist 01, Ho Chi Minh City, Vietnam

    Le Hong Phuc

Authors
  1. Nguyen Viet Long
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  2. Yong Yang
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  3. Cao Minh Thi
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  4. Le Hong Phuc
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  5. Masayuki Nogami
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Correspondence to Nguyen Viet Long.

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Long, N.V., Yang, Y., Thi, C.M. et al. Controlled Synthesis and Magnetic Properties of Uniform Hierarchical Polyhedral α-Fe2O3 Particles. J. Electron. Mater. 46, 3301–3308 (2017). https://doi.org/10.1007/s11664-017-5360-9

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  • DOI: https://doi.org/10.1007/s11664-017-5360-9

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