Reference : Mossbauer spectral evidence for next-nearest neighbor interactions within the alluaudite...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
Physical, chemical, mathematical & earth Sciences : Physics
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/7838
Mossbauer spectral evidence for next-nearest neighbor interactions within the alluaudite structure of Na1-xLixMnFe2(PO4)(3)
English
Hermann, Raphaël mailto [Université de Liège - ULg > Département de physique > Département de physique >]
Hatert, Frédéric mailto [Université de Liège - ULg > Département de géologie > Minéralogie et cristallochimie >]
Fransolet, André-Mathieu mailto [Université de Liège - ULg > Département de géologie > Minéralogie et cristallochimie >]
Long, Gary J [> > > >]
Grandjean, Fernande mailto [Université de Liège - ULg > Département de physique > Département de physique >]
Apr-2002
Solid State Sciences
Editions Scientifiques Medicales Elsevier
4
4
507-513
Yes
International
1293-2558
Paris
France
[en] The Mossbauer spectra of the Na1-xLixMnFe2(PO4)(3) compounds, with x = 0,00, 0.25, 0.50, and 0.75, have been measured between 90 and 295 K and analyzed in terms of a model which takes into account the next-nearest neighbor interactions within the alluaudite structure. Surprisingly, the spectra reveal an unexpected presence of iron(II) in these compounds; the amount of iron(II) is observed to decrease from 19 to 15 atomic percent of the total iron content with increasing x. The temperature dependence of the Fe2+ and Fe3+ isomer shifts agrees with that expected from a second-order Doppler shift and the resulting iron vibrating masses and Mossbauer lattice temperatures are within the expected range of values for iron cations in an octahedral environment. The temperature dependence of the Fe2+ quadrupole splitting has been fit with the Ingalls' model and the results yield a ground state orbital splitting of ca. 500 cm(-1) for the iron(II) sites. The compositional dependence of the isomer shifts and Fe2+ content can be understood in terms of a decrease in the unit-cell volume with increasing substitution of sodium by lithium, a substitution which does not influence the observed quadrupole splittings. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.
Researchers
http://hdl.handle.net/2268/7838
also: http://hdl.handle.net/2268/100376

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Restricted access
Mössbauer alluaudites Li-Na-Mn-Fe.pdfPublisher postprint293.91 kBRequest copy

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.