How to convert Fe3O4 to alpha Fe2O3? Can we convert it by annealing in air, if yes, the at what temperature?
Yes you can do it. Try 400 oC or/and above annealing temperature in air for 2 hrs. You may see my papers on iron oxide (Hematite) thin films .
There are two types of Haematite alpha and gamma. You can go from magnetite to gamma-haematite by careful oxidation; and the heating gamma -haematite at EQG 600C you may get alpha-haematite according to A. F. Wells (SEE: page 545.
But you can go directly from magnetite to alpha haematite by heating slowly at 1300oC (Wells).
@ Saleem Can you please give me link of your paper ?
@Luis: Thanks, its really helpful to clear concepts.
You should be able to oxidize in air at high temperature as other suggested.
Pooja, You can download articles using the following links:
http://www.sciencedirect.com/science/article/pii/S0925838812001879
http://iopscience.iop.org/1402-4896/85/5/055802/article
if you have any problem while downloading these papers, you may also download from my profile or I will send you on your request.
In addition to this, I will recommend you to see the "Phase Diagram" of Iron and Iron Oxide.
I work on Hydrothermal synthesis of spinel(Zn-substituded magnetite) from hematite in 175 °C and 15 hour. but after 15hour in 175° C spinel was converted to Hematite.Do you Know,why is Spinel converted to Hematite after 15 hour in constant Temperature? Please, Introdue Article aboat This Topic to me. Thanks
Hi, I study it and I think that conversion of Fe3O4 to alfa-Fe2O3 occurs at temperature above 400.
I need a mechanism other than heat to convert magnetite to hematite (or ferrihydrite). I'm working on a rock formation that is only one million years old, has never been buried; the formation began as shallow ocean bottom As it uplifted, it may have next been a coastal salt marsh, then a forest. The lithified rocks are cemented by hematite/ferrihydrite. Here are the potential processes to do the conversion: cold temperature (during the Pleistocene), salt water (of the ocean), iron or sulfur cycle microbial catalysis, and organic matter (of the marsh vegetation). Can anyone share any such low temperature ideas?
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