Journal
JOURNAL OF ELECTRONIC MATERIALS
Volume 46, Issue 6, Pages 3301-3308Publisher
SPRINGER
DOI: 10.1007/s11664-017-5360-9
Keywords
alpha-Fe2O3; hematite; grains and grain boundaries; hierarchical particles
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Funding
- Vietnam National Foundation for Science and Technology Development (NAFOSTED) [103.02-2016.92]
- Ceramics and Biomaterials Research Group, Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam
- Shanghai Institute of Ceramics, Chinese Academy of Science from China
- Nagoya Institute of Technology, Kyushu University from Japan
- Kyoto University from Japan
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The controlled synthesis of uniform hierarchical polyhedral iron (Fe) micro-/nanoscale oxide particles with the alpha-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 alpha-Fe2O3 hematite with a micro-/nanoscale structure. The structure and weak ferromagnetism of the alpha-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 alpha-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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