Heterogeneously Junctioned Nano-Particles of Hematite and Goethite Formed in a Wet Process
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- Iwasaki Kazuharu
- Core Technology & Network Company, Sony Corporation
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- Itoh Takuya
- Core Technology & Network Company, Sony Corporation
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- Yamamura Tsutomu
- Department of Metallurgy, Graduate School of Engineering, Tohoku University
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Acicular α-FeOOH particles are formed through aging of ferric oxyhydroxide colloidal solution formed by the neutralization of FeCl3 aqueous solution by NaOH . The effect of foreign ion addition to the colloidal solution on the formation and morphology of α-FeOOH particles has been investigated. The magnetic properties of Fe3O4 particles made from the obtained particles have also been investigated. The rate constant of the formation of α-FeOOH remarkably decreased, but the crystallite size of α-FeOOH particles increased with increasing the quantity of phosphate ion added even with small amounts. These results have been explained as follows: the phosphate ions are selectively adsorbed on the (a) plane of α-FeOOH, cover the (a) plane, and block the crystal growth of the (a) plane of the α-FeOOH . The quantities of the phosphate ion adsorbed on the b and c planes are relatively small. The complex ion of Fe(OH)4− is preferentially deposited on both (b) and (c) planes, and the crystal growth of (b) and (c) planes is greatly accelerated. The relationship between the morphology of the formed α-FeOOH particles and the quantity of phosphate ion added has been investigated. The asterisk type particles: α-FeOOH particles heterogeneously junctioned to α-Fe2O3 particles, were formed when a small amount of phosphate was added to the mother liquid. The α-FeOOH crystal epitaxially grew on the junction interface with the α-Fe2O3 crystal. In the case of the aging at the temperature as high as 80°C, the cross type junctioned particles were stably formed at pH below 12.0. The Fe3O4 particles with screw-like unique three-dimensional morphology were produced from the heterogeneously junctioned particles.
収録刊行物
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 42 (8), 1629-1637, 2001
公益社団法人 日本金属学会
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詳細情報 詳細情報について
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- CRID
- 1390282679223943936
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- NII論文ID
- 10007260263
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- NII書誌ID
- AA1151294X
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- COI
- 1:CAS:528:DC%2BD3MXnt1CltL0%3D
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- ISSN
- 13475320
- 13459678
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- NDL書誌ID
- 5890400
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 使用不可