水酸化鉄 (II) ゲルの酸化におけるα-FeOOHの溶解析出過程

• 佐藤 孝順

  千葉工業大学工業化学科

• 岡本 祥一

  長岡技術科学大学電気系

• 橋本 甲四郎

  千葉工業大学工業化学科

書誌事項

タイトル別名

• The Formation of α-FeOOH from Fe(OH)₂ Gel by the Dissolution-Precipitation Process
• スイサンカ テツ 2 ゲル ノ サンカ ニ オケル アルファ FeOOH ノ

抄録

Coarse crystals of Fe(OH)₂ were prepared by adding iron (II) sulfate solutions to concentrated sodium hydroxide solutions at around 80°C. The Fe(OH)₂ gel was oxidized at 7°C by air bubbling. The oxidation of Fe(OH)₂ proceeded by the zeroorder reaction with its rate independent of the size of hexagonal Fe(OH)₂ crystals which turned into acicular α-FeOOH crystals. The rate-determining step of the oxidation may be the dissolution of oxygen into the solution. In the oxidation process of the coarse Fe(OH)₂ gels, star-shaped aggregates composed of six α-FeOOH crystals were formed Electron-diffraction analysis of the star-shaped aggregates indicated that the six equivalent [100] directions in the hexagonal crystal of Fe(OH)₂ coincide with the [010] direction in each of six crystals of orthorhombic α-FeOOH. The oxygen arrangement on the (100)_hex planes of Fe(OH)₂ is equivalent to that on the (010)_orth planes of α-FeOOH. It is concluded that Fe(OH)₂ crystals in the solution are oxidized selectively on their (100) planes, followed by epitaxial growth of α-FeOOH.

収録刊行物

• 窯業協會誌

  窯業協會誌 94 (1096), 1201-1205, 1986

  公益社団法人 日本セラミックス協会

キーワード

• Oxidation of ferrous hydroxide
• Star-shaped crystal
• Goethite
• Epitaxy
• Dissolution-precipitation reaction

詳細情報

• CRID: 1390282680225257216
• NII論文ID: 110002313535
• NII書誌ID: AN00245650
• DOI: 10.2109/jcersj1950.94.1096_1201
• ISSN: 18842127
• ISSN: 00090255
• NDL書誌ID: 3106643
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3106643
• Web Site: http://www.jstage.jst.go.jp/article/jcersj1950/94/1096/94_1096_1201/_pdf
• 本文言語コード: ja
• データソース種別:
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  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可