Startseite Critical evaluation of the revised akdalaite model for ferrihydrite—Reply
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Critical evaluation of the revised akdalaite model for ferrihydrite—Reply

  • Alain Manceau EMAIL logo
Veröffentlicht/Copyright: 2. April 2015
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 97 Heft 1

Abstract

The XRD pattern of hydromaghemite, previously interpreted as a mixture of hydroxylated maghemite, ferrihydrite, and hematite (Barrón et al. 2003; Liu 2008), has been reinterpreted as being from a new form of ferrihydrite called “ferrimagnetic ferrihydrite” (ferrifh, Michel et al. 2010; Barrón et al. 2012). Although ferrihydrite sensu stricto and ferrifh have distinct XRD patterns, their profiles have been fit with the same akdalaite-type model using atomic pair distribution (PDF) analysis (Michel et al. 2007, 2010). This ambivalence shows that the crystal structure problem is ill-conditioned, as often the case for the study of nanostructured materials by PDF (Billinge and Levin 2007).

Keywords : Ferrihydrite; hydromaghemite; PDF; atomic pair distribution; akdalaite model
Received: 2011-7-18
Accepted: 2011-8-2
Published Online: 2015-4-2
Published in Print: 2012-1-1

© 2015 by Walter de Gruyter Berlin/Boston

Artikel in diesem Heft

  1. Boron in natural type IIb blue diamonds: Chemical and spectroscopic measurements
  2. Mejillonesite, a new acid sodium, magnesium phosphate mineral, from Mejillones, Antofagasta, Chile
  3. Silician magnetite from the Dales Gorge Member of the Brockman Iron Formation, Hamersley Group, Western Australia
  4. The mechanism of thermal decomposition of dolomite: New insights from 2D-XRD and TEM analyses
  5. A revised diamond-graphite transition curve
  6. Insights into the crystal and aggregate structure of Fe3+ oxide/silica co-precipitates
  7. Compositional dependence of alkali diffusivity in silicate melts: Mixed alkali effect and pseudo-alkali effect
  8. Kinetics of evaporation of forsterite in vacuum
  9. X-ray absorption near edge structure (XANES) study of the speciation of uranium and thorium in Al-rich CaSiO3 perovskite
  10. Rehydration of dehydrated-dehydroxylated smectite in a low water vapor environment
  11. Effect of high pressure on the crystal structure and electronic properties of magnetite below 25 GPa
  12. OH group behavior and pressure-induced amorphization of antigorite examined under high pressure and temperature using synchrotron infrared spectroscopy
  13. Single-crystal Raman spectroscopy of natural paulmooreite Pb2As2O5 in comparison with the synthesized analog
  14. The dissolution of laumontite in acidic aqueous solutions: A controlled-temperature in situ atomic force microscopy study
  15. Crystal structure of CaRhO3 polymorph: High-pressure intermediate phase between perovskite and post-perovskite
  16. Oxide melt solution calorimetry of Fe2+-bearing oxides and application to the magnetite–maghemite (Fe3O4–Fe8/3O4) system
  17. Static compression of (Mg0.83,Fe0.17)O and (Mg0.75,Fe0.25)O ferropericlase up to 58 GPa at 300, 700, and 1100 K
  18. Implications of ferrous and ferric iron in antigorite
  19. Markascherite, Cu3(MoO4)(OH)4, a new mineral species polymorphic with szenicsite, from Copper Creek, Pinal County, Arizona, U.S.A.
  20. Natural hydrous amorphous silica: Quantitation of network speciation and hydroxyl content by 29Si MAS NMR and vibrational spectroscopy
  21. Lead-tellurium oxysalts from Otto Mountain near Baker, California: VII. Chromschieffelinite, Pb10Te6O20(OH)14(CrO4)(H2O)5, the chromate analog of schieffelinite
  22. Experimental growth of diopside + merwinite reaction rims: The effect of water on microstructure development
  23. Thermodynamic model for growth of reaction rims with lamellar microstructure
  24. The high-pressure behavior of micas: Vibrational spectra of muscovite, biotite, and phlogopite to 30 GPa
  25. Critical evaluation of the revised akdalaite model for ferrihydrite—Discussion
  26. Critical evaluation of the revised akdalaite model for ferrihydrite—Reply
https://doi.org/10.2138/am.2012.3954
Schlagwörter für diesen Artikel
Ferrihydrite; hydromaghemite; PDF; atomic pair distribution; akdalaite model

Artikel in diesem Heft

  1. Boron in natural type IIb blue diamonds: Chemical and spectroscopic measurements
  2. Mejillonesite, a new acid sodium, magnesium phosphate mineral, from Mejillones, Antofagasta, Chile
  3. Silician magnetite from the Dales Gorge Member of the Brockman Iron Formation, Hamersley Group, Western Australia
  4. The mechanism of thermal decomposition of dolomite: New insights from 2D-XRD and TEM analyses
  5. A revised diamond-graphite transition curve
  6. Insights into the crystal and aggregate structure of Fe3+ oxide/silica co-precipitates
  7. Compositional dependence of alkali diffusivity in silicate melts: Mixed alkali effect and pseudo-alkali effect
  8. Kinetics of evaporation of forsterite in vacuum
  9. X-ray absorption near edge structure (XANES) study of the speciation of uranium and thorium in Al-rich CaSiO3 perovskite
  10. Rehydration of dehydrated-dehydroxylated smectite in a low water vapor environment
  11. Effect of high pressure on the crystal structure and electronic properties of magnetite below 25 GPa
  12. OH group behavior and pressure-induced amorphization of antigorite examined under high pressure and temperature using synchrotron infrared spectroscopy
  13. Single-crystal Raman spectroscopy of natural paulmooreite Pb2As2O5 in comparison with the synthesized analog
  14. The dissolution of laumontite in acidic aqueous solutions: A controlled-temperature in situ atomic force microscopy study
  15. Crystal structure of CaRhO3 polymorph: High-pressure intermediate phase between perovskite and post-perovskite
  16. Oxide melt solution calorimetry of Fe2+-bearing oxides and application to the magnetite–maghemite (Fe3O4–Fe8/3O4) system
  17. Static compression of (Mg0.83,Fe0.17)O and (Mg0.75,Fe0.25)O ferropericlase up to 58 GPa at 300, 700, and 1100 K
  18. Implications of ferrous and ferric iron in antigorite
  19. Markascherite, Cu3(MoO4)(OH)4, a new mineral species polymorphic with szenicsite, from Copper Creek, Pinal County, Arizona, U.S.A.
  20. Natural hydrous amorphous silica: Quantitation of network speciation and hydroxyl content by 29Si MAS NMR and vibrational spectroscopy
  21. Lead-tellurium oxysalts from Otto Mountain near Baker, California: VII. Chromschieffelinite, Pb10Te6O20(OH)14(CrO4)(H2O)5, the chromate analog of schieffelinite
  22. Experimental growth of diopside + merwinite reaction rims: The effect of water on microstructure development
  23. Thermodynamic model for growth of reaction rims with lamellar microstructure
  24. The high-pressure behavior of micas: Vibrational spectra of muscovite, biotite, and phlogopite to 30 GPa
  25. Critical evaluation of the revised akdalaite model for ferrihydrite—Discussion
  26. Critical evaluation of the revised akdalaite model for ferrihydrite—Reply
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