EFFECT OF HEATING IN AIR ON Si- AND Ge-CONTAINING FERRIHYDRITES

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概要

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• The transformation of two natural siliceous ferrihydrites to hematite has been observed by X-ray diffraction, Moessbauer spectroscopy, weight loss and colour change. Three synthetic ferrihydrites (a 2-line pure sample, a 7-line Si-containing sample and a 7-line Ge-containing sample) have been used for comparison. The inhibitory effect of Si on the transformation, as observed previously, has been confirmed, and Ge has been found to exert a similar effect. Adsorption of soluble silicate onto the 2-line pure ferrihydrite also produced an inhibitory effect. It was possible to reduce OH : Fe ratios in ferrihydrites to the order of 1 : 10 or less without an apparent phase change, and the essentiality of H_2O and OH^- in the ferrihydrite structure is questioned. The results are consistent with a model in which Si- or Ge-hydroxy anions are bonded to, and bridge, the surfaces of crystalline domains within each primary particle of ferrihydrite.

• 日本粘土学会の論文

著者

• Yoshinaga Naganori

  Department of Agricultural Chemistry, Faculty of Agriculture, Ehime University

• Childs Cyril

  Manaaki Whenua-landcare Research

• KANASAKI NOBORU

  Department of Agricultural Chemistry, Ehime University

• Yoshinaga Naganori

  Department Of Agricultural Chemistry Ehime University

• Kanasaki Noboru

  Department Of Agricultural Chemistry Ehime University

関連論文

• Ferrihydrite in Volcanic Ash Soils of Japan
• Chemical and Mineralogical Properties of Volcanic Ash Soils from Java
• EFFECT OF HEATING IN AIR ON Si- AND Ge-CONTAINING FERRIHYDRITES
• FERRIHYDRITE DEPOSITS IN PADDY RACES, ASO-DANI

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