Hello, I got a pure phase at X-ray diffraction of my phosphate based on Fe3+, but when I did the Mossbauer, I found two doublets of Fe3+ Octa, but I had to get just one doublet of Fe3+ Octa. Please, any one have an idea about that?
thank you for your help
How about the relative intensities? Did you consider impurity/defect/mixed valence not necessarily detected by X-ray? Can you perform XPS anaylsis?
The spectrum tells about two different environments for Fe3+. Is it all Fe3+?? What about the isomer shift? I have the same doubt as Gyorgy.
@Gyorgy Banhegyi I have a pure phase, I refined it with fullprof program, also I did the EDX and there is no traces of impurities.
thank you for your help
@Ana Mijovilovich I have two octahedral sites of Fe3+, In fact there are two atoms of Fe3+ and both f them are in octahedral sites in my phosphates.
but in Mossbauer spectrum I got two doublets of Fe3+ in octahedral sites.(Is1=0.42 Qs=0.45) and (Is2=0.44 and Qs=0.28)
Then the sites are both octahedral but different so the quadrupole moment is different. I leave you with a question: Is the ratio of areas for both sites in agreement with the proportion between both sites?
Hi,
is it a pure only Fe3+ containing phosphate, or have you e.g. Mn distibuted also on the one octahedral site you expect in your sample, Especially Mn can easily yield strong distortions to the local enviromenets around the Fe nuclei and you might have a QS distribution. Otherwise you may have indeed two different octahedral sites in your material and the cyrstal strucuture is different to what you might expect ?!
- Badges
- Science method
- Similar topics
- Methodology
- Crystallography
- X-ray Diffraction