Effects of Manganese and Nickel Ions on the Structure of Iron Oxyhydroxides and Oxides Obtained from Green Rust in Aqueous Solution

Quantitative X-ray diffraction analysis coupled with the reverse Monte Carlo simulation technique has been made for characterizing the structure of iron oxyhydroxides and oxides formed from green rust (GR) with manganese ions and nickel ions in aqueous solution. The main component of GR(ox) was found to be alfa-FeOOH in all cases presently investigated. The distortion in the atomic-scale structure of alfa-FeOOH particles was clearly found to be induced by the existence of manganese ion. Such structural variation was not observed in the structure of a-FeOOH obtained from GR(ox) with nickel ion.