Article (Scientific journals)
Mossbauer spectral evidence for next-nearest neighbor interactions within the alluaudite structure of Na1-xLixMnFe2(PO4)(3)
Hermann, Raphaël; Hatert, Frédéric; Fransolet, André-Mathieu et al.
2002In Solid State Sciences, 4 (4), p. 507-513
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Abstract :
[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.
Disciplines :
Physics
Earth sciences & physical geography
Chemistry
Author, co-author :
Hermann, Raphaël ;  Université de Liège - ULiège > Département de physique > Département de physique
Hatert, Frédéric  ;  Université de Liège - ULiège > Département de géologie > Minéralogie et cristallochimie
Fransolet, André-Mathieu ;  Université de Liège - ULiège > Département de géologie > Minéralogie et cristallochimie
Long, Gary J
Grandjean, Fernande ;  Université de Liège - ULiège > Département de physique > Département de physique
Language :
English
Title :
Mossbauer spectral evidence for next-nearest neighbor interactions within the alluaudite structure of Na1-xLixMnFe2(PO4)(3)
Publication date :
April 2002
Journal title :
Solid State Sciences
ISSN :
1293-2558
Publisher :
Editions Scientifiques Medicales Elsevier, Paris, France
Volume :
4
Issue :
4
Pages :
507-513
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 05 March 2009

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