非晶質含水酸化第二鉄の構造

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  • Structure of Amorphous Ferric Oxyhydroxide
  • ヒショウシツ ガン スイサンカ ダイ2テツ ノ コウゾウ

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Short range order (SRO) structure of amorphous “ferric oxyhydroxide gel” was derived from radial distribution function (RDF) applied to its X-ray scattering intensities, I(s). The SRO structure was different from that of any well defined iron-compounds, such as iron oxides or oxyhydroxides. To determine the observed SRO structure, reduced RDF's, G(r)'s, simulated from these compounds, were compared with observed ones. The simulation was executed by use of a structure derived from hydrolytic polymeric condensation of hexaaquoiron (III) complex in which lattice sites were occupied by Fe3+ ions with a successive occupation probability for octahedral and tetrahedral sites. Namely, the structure was changed from a NaCl type of deficient structure, Fe3+1-xO, to a modified type of spinel one, γ-Fe2O3. Here O2- sites in the structure are assumed to be equally occupied by O2- and OH- ions to reflect chemical constituent of the gel, FeO·OH. From these G(r)'s simulated above it was found that the rapidly dried gel specimen has site's occupation probabilities(%) of AS(tet)=30.0 and BS(oct)=85.0, and those of slowly desiccated one are AS(tet)=80.0 and BS(oct)=60.0, respectively. The structure successfully explains Mössbauer spectrum, magnetic nature and density of the gel. This structure is believed to be also useful to introduce information on “passive films”.

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