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Hematite internal structure

Hematite forms by a combination of aggregation-dehydration-rearrangement process for which the presence of water appears essential. Structural details about this process at 92 °C were obtained from EXAFS (Combes et al. 1989 1990) face-sharing between Fe octahedra developed before XRD showed any evidence for hematite. It is followed by internal redistribution of vacancies in the anion framework and by further dehydration. The dehydration process involves removal of a proton from an OH group and this in turn leads to elimination of a water molecule and formation of an 0X0 linkage. The local charge inbalance caused by proton loss is compensated for by migration and redistribution of Fe " within the cation sublattice. [Pg.391]

See other pages where Hematite internal structure is mentioned: [Pg.70]    [Pg.71]    [Pg.436]    [Pg.436]    [Pg.453]    [Pg.144]    [Pg.206]    [Pg.24]    [Pg.328]    [Pg.373]    [Pg.210]   
See also in sourсe #XX -- [ Pg.70 ]



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