Crystal structural change of iron hydroxide by nanoparticulation
Project/Area Number |
24740352
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Research Category |
Grant-in-Aid for Young Scientists (B)
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Allocation Type | Multi-year Fund |
Research Field |
Petrology/Mineralogy/Science of ore deposit
|
Research Institution | University of Tsukuba |
Principal Investigator |
KYONO Atsushi 筑波大学, 生命環境系, 講師 (40375431)
|
Project Period (FY) |
2012-04-01 – 2014-03-31
|
Project Status |
Completed (Fiscal Year 2013)
|
Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
|
Keywords | フェリハイドライト / ヘマタイト / ナノ鉱物 / PDF法 / 相転移 / 粒径サイズ / Ferrihydrite / ナノ粒子 / 粒径変化 / 原子対分布関数(PDF)法 / TEM |
Research Abstract |
Aggregation-induced phase transition of ferrihydrite to hematite was investigated using atomic pair distribution function (PDF) analysis of synchrotron x-ray total scattering experiments. The particle size of six-line ferrihydrite estimated from attenuation of the PDF increases from about 4 nm to above 10 nm. Then the ferrihydrite starts to transform to hematite. The ferrihydrite structure exhibits a strong tendency for the a lattice parameter to decrease with particle size. As the a lattice parameter decreases continuously, contractions of the six-membered rings occur. When a six-membered ring comprising three FeO6 octahedra and three FeO4 tetrahedra is contracted, the FeO4 tetrahedral coordination changes to octahedral. Consequently, the six-membered ring transforms to that comprising six FeO6 octahedra, which is the same configuration as that of hematite. This coordination change caused by the six-membered ring contraction induces the phase transition of ferrihydrite to hematite.
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Report
(3 results)
Research Products
(26 results)
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[Presentation] High-pressure rhombohedral Fe2SiO4 and structure change with spin state2012
Author(s)
Yamanaka, T., Kyono, A., Nakmoto, Y., Kharlamova, S., Struzhkin, V.V., Mao, H., Hemley, R.J.
Organizer
日本地球惑星科学連合大会
Place of Presentation
幕張国際会議場,千葉
Related Report
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[Presentation] Correlation between structure transition and electron spin state of earth's interiors under high pressure2012
Author(s)
Yamanaka, T., Kharlamova, S., Kyono, A., Nakamoto, Y., Struzhkin, V.V., Mao, H., Hemley, R.J.
Organizer
European Mineralogical Conference
Place of Presentation
フランクフルト,ドイツ
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