Format:
Online-Ressource
ISSN:
1945-3027
Content:
Abstract: Studies suggest that feitknechtite (β-MnOOH) is a prevalent, and perhaps necessary, intermediate phase during the synthesis of birnessite-like phases, the abiotic oxidation of Mn2+, and the transformation of biogenic hexagonal phyllomanganates to more complex Mn oxides in laboratory and natural systems. Researchers have generally described feitknechtite as consisting of pyrochroite-like (or cadmium iodide-like) Mn-O octahedral layers, but a detailed crystal structure has not been reported. We used TEM/SAED and powder XRD and Rietveld refinements to derive the unit cell and, for the first time, report a complete structure description for feitknechtite (β-MnOOH). Rietveld refinements were also completed for three natural feitknechtite/hausmannite samples, and time-resolved synchrotron XRD experiments were used to follow the thermal transformation of feitknechtite to hausmannite. Additionally, we identified and report the structure for a second, and perhaps novel, MnOOH polymorph (proposed designation ε-MnOOH), mixed with the synthetic feitknechtite, that is similar to β-MnOOH but with a different layer stacking.
In:
volume:108
In:
number:11
In:
year:2023
In:
pages:2131-2141
In:
extent:11
In:
American mineralogist, Berlin : de @Gruyter, 1916-, 108, Heft 11 (2023), 2131-2141 (gesamt 11), 1945-3027
Language:
English
DOI:
10.2138/am-2022-8729
URN:
urn:nbn:de:101:1-2023103013101347074150
URL:
https://doi.org/10.2138/am-2022-8729
URL:
https://nbn-resolving.org/urn:nbn:de:101:1-2023103013101347074150
URL:
https://d-nb.info/1307954456/34
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