Structural changes and surface oxidation state were examined following the reaction of hematite (001), (012), and (110) with aqueous Fe(II). X-ray reflectivity measurements indicated that Fe(II) induces changes in the structure of all three surfaces under both acidic (pH 3) and neutral (pH 7) conditions. The structural changes were generally independent of pH although the extent of surface transformation varied slightly between acidic and neutral conditions; no systematic trends with pH were observed. Induced changes on the (110) and (012) surfaces include the addition or removal of partial surface layers consistent with either growth or dissolution. In contrast, a
Revised: August 9, 2010 |
Published: March 1, 2010
Citation
Catalano J.G., P. Fenter, C. Park, Z. Zhang, and K.M. Rosso. 2010.Structure and Oxidation State of Hematite Surfaces Reacted with Aqueous Fe(II) at Acidic and Neutral pH.Geochimica et Cosmochimica Acta 74, no. 5:1498-1512.PNNL-SA-70256.doi:10.1016/j.gca.2009.12.018