I'm working on Mossbauer spectroscopy of hexaferrites, in which Fe resides in 5 different crystallographic sites. I'm trying to analyse the Mossbauer data using MossA software. There is an option to load sites. But I don't know from where I can get this. Could anyone please help me out?
Dear Nishkala Rao .
The sites in MossA fitting program are related to the Fen+ occupancies. It is necessary to allocate the Fe atoms inside the crystallographic sites. For instance, octahedra, tetrahedra, square planar, and so on.
The Mössbauer parameters define the sites, BHf, ISO, QUA... and so on.
For instance, magnetite, Fe3O4, has one 6 line sextet allocated to Fe3+ in the tetrahedral site; and another 6 line sextet in 1/2 of the octahedral site occupancy. Another Fe2+ sextet will occupy the remaining 1/2 of the octahedral site since it is an inverse spinel structure. I am speaking on regular Mössbauer spectra.
The BHF, ISO, QUA values are related to the respective Fe atoms and oxidation state over a specific site.
If a superparamagnetic component is present as a central duplet, it must be associated with the iron fraction with tiny particle size.
On the documentation of the MossA fitting program, you find explanations and tutorial examples.
Best regards,
WNM
Thank Sir for your answer. I have fitted the Mossbauer spectra of M-type hexaferrite, which contain 5 sextet in it. using intensity ratios i have indexed the peaks also. Is the method is correct?
Dear Nishkala Rao ,
I guess it is correct. Check carefully the central part if no superparamagnetic effect is present. The effect is usually found when fine particle size is present in the type of sample you are using and maybe mistakenly false inducing the necessity of more sextet components to full-spectrum fitting.
Best regards,
WNM
- Badges
- Science topic
- Similar topics
- Gels