Abstract
The EXAFS analysis of ferric oxide particles precipitated from ferric aqueous solutions including chloride ion and with/without additional anions such as sulfate or silicate. In the solution reaction process, an akaganeite (β-FeOOH)-like oxyhydroxide with low crystallinity is precipitated and subsequently transforms to hematite (α-Fe2O3). Coexistence of anion species of sulfate or silicate is effective to reduce the rate of structural transformation and influence morphology of final iron oxide products. The radial distribution functions was obtained by Fourier transformation from EXAFS spectra measured at Fe K absorption edge, and Debye-Waller factor related to Fe-Fe correlation was determined. The results indicated that the linkages with face-sharing and double-corner-sharing were influenced by adding anions in corrosion reaction solutions. [DOI: 10.1380/ejssnt.2008.60]
Highlights
Various ferric or ferrous hydroxides, oxyhydroxides and oxides are formed from the ferric or ferrous aqueous solutions and their final structure depends on the environmental conditions
The results indicated that some elements strongly influence the reaction rate, formation and morphology of final products in aqueous solution systems
The lattice constant a, c for the sample obtained from the solution including no additional anion determined by whole powder pattern decomposition (WPPD) using Pawley method were a = 0.50358(4) nm, c = 1.3782(1) nm
Summary
Influence of Anion Coexistence on Crystal Structure of Iron Oxides Deposited from Steel Surfaces ∗. Kozo Shinoda† Institute of Multidisciplinary Research for Advanced Materials, Tohoku Univ., Sendai, Japan, Sang-Koo Kwon LG Electronics Institute of Technology, Seoul, Korea. Shigeru Suzuki and Yoshio Waseda Institute of Multidisciplinary Research for Advanced Materials, Tohoku Univ., Sendai, Japan (Received 26 November 2007; Accepted 29 January 2008; Published 16 February 2008). The EXAFS analysis of ferric oxide particles precipitated from ferric aqueous solutions including chloride ion and with/without additional anions such as sulfate or silicate. In the solution reaction process, an akaganeite (β-FeOOH)-like oxyhydroxide with low crystallinity is precipitated and subsequently transforms to hematite (αFe2O3). Coexistence of anion species of sulfate or silicate is effective to reduce the rate of structural transformation and influence morphology of final iron oxide products.
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