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Science Forum Index » Materials Forum » Need help on oxygen parameter of magnetite and gama-Fe2O3
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| xuesong jin |
 Posted: Mon Jul 28, 2003 12:22 pm |
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Guest
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Hi, all
I wondered that is there any result for the change in oxygen
parameter during transtion of magnetite to gama-Fe2O3? How the XRD
relative peak intensity change during this transition? I am
interesting in the change of relative peak intersity between 200 and
311 peak.
Is there a software that I can calculate the XRD relative peak
intensity with different oxygen parameter?
If anyone could give me a advice, it will be highly appreciated.
Have a nice day!
Xuesong Jin |
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| Nils Dalen |
| Posted: Mon Jul 28, 2003 6:07 pm |
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Guest
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xuesongj@tcd.ie (xuesong jin) wrote in message news:<1e556788.0307281022.88a7fcb@posting.google.com>...
Quote: Hi, all
I wondered that is there any result for the change in oxygen
parameter during transtion of magnetite to gama-Fe2O3? How the XRD
relative peak intensity change during this transition? I am
interesting in the change of relative peak intersity between 200 and
311 peak.
Is there a software that I can calculate the XRD relative peak
intensity with different oxygen parameter?
If anyone could give me a advice, it will be highly appreciated.
Have a nice day!
Try a program called "powedercell". It is free and will simulate the
diffraction peaks if you have the structure.
http://users.omskreg.ru/~kolosov/bam/a_v/v_1/powder/e_cell.htm
Alternately, you could check if your library or some other group has
the JCPDF database, it will be there as well.
Gamma has a supercell of ordered vacancies (if I recall correctly).
The thing to watch for is if the superlattice peaks show up, as these
are not allowed for cubic Magnetite.
Another trick is getting Magnetitite to convert to gamma Fe2O3 rather
than changing to alpha. If you are using a simple heat with oxygen,
you will likely get some or all alpha. Try bubbling the O2 through
water to force the gamma phase.
Nils |
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