Reference : An X-ray Rietveld, infrared, and Mossbauer spectral study of the NaMn(Fe1-xInx)(2)(PO4)(...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/7835
An X-ray Rietveld, infrared, and Mossbauer spectral study of the NaMn(Fe1-xInx)(2)(PO4)(3) alluaudite-type solid solution
English
Hatert, Frédéric mailto [Université de Liège - ULg > Département de géologie > Minéralogie et cristallochimie >]
Hermann, Raphaël mailto [Université de Liège - ULg > Département de physique > Département de physique >]
Long, Gary J. [University of Missouri-Rolla > Department of Chemistry > > >]
Fransolet, André-Mathieu mailto [Université de Liège - ULg > Département de géologie > Minéralogie et cristallochimie >]
Grandjean, Fernande mailto [Université de Liège - ULg > Département de physique > Département de physique >]
2003
American Mineralogist
Mineralogical Soc Amer
88
1
211-222
Yes (verified by ORBi)
International
0003-004X
Washington
DC
[en] Several compounds of the NaMn(Fe1-xInx)(2)(PO4)(3) solid solution were synthesized by solid state reaction in air; pure alluaudite-like compounds were obtained for x = 0.00 to 1.00. X-ray Rietveld refinements indicate the presence of Na+ at the A1 and A2' sites, Mn2+ at the M1 site, and Fe2+, Fe3+, and In3+ at the M2 site. The presence of small amounts of In3+ at the M I site, and Mn2+ at the M2 site, indicates a partially disordered distribution between these cations. A good correlation was also established between the M1-M2 bond distance and the beta angle of the alluaudite-like compounds. The disordered distribution of Fe2+, Fe3+, and In3+ at the M2 site is confirmed by the broadness of the infrared absorption bands. The Mossbauer spectra, measured between 90 and 295 K, were analyzed in terms of a model that takes into account the next-nearest neighbor interactions around the M2 crystallographic site. In all cases these spectra reveal the unexpected presence of small amounts of Fe2+ at the M2 site, an amount that decreases as the In3+ content increases. The Fe2+ and Fe3+ isomer shifts are typical of the alluaudite structure and vary with temperature, as expected from a second-order Doppler shift. The derived iron vibrating masses and Mossbauer lattice temperatures are within the expected range of values for iron cations in an octahedral environment. The Fe2+ and Fe3+ quadrupole splittings are also typical of the alluaudite structure and the temperature dependence of the Fe2+ quadrupole splitting was fit with the model of Ingalls (1964), which yielded a ground state orbital splitting of ca. 380 to 570 cm(-1) for the Fe2+ sites.
Researchers
http://hdl.handle.net/2268/7835
also: http://hdl.handle.net/2268/100379

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