Simulation of Natural Iron Oxide Alteration in Soil: Conversion of Synthetic Ferrihydrite to Hematite Without Artificial Dopants, Observed With Magnetic Methods

• Published in: Geochemistry, geophysics, geosystems : G3 Vol. 21; no. 7
• Main Authors: Bilardello, Dario, Banerjee, Subir K., Volk, Michael W. R., Soltis, Jennifer A., Penn, R. Lee
• Format: Journal Article
• Language: English
• Published: Washington John Wiley & Sons, Inc 01.07.2020; Wiley
• Subjects: Crystals; Electron microscopy; Environmental conditions; ferrimagnetic ferrihydrite; Goethite; Haematite; hematite; hydromaghemite; Iron oxides; Ligands; loess; magnetic enhancement; Magnetic field; Magnetic fields; Paleoprecipitation; Soil; Stabilizing

We present new results on the conversion of pure, undoped synthetic ferrihydrite, wet‐annealed at pH 6.56 and 90°C without stabilizing ligands, to nanophase goethite, hematite, and an intermediate magnetic phase, nanophase maghemite. Our analyses included magnetic field and temperature‐dependent pro...