Site occupancies in the R2-xFe14+2xSi3
(R = Ce, Nd, Gd, Dy, Ho, Er, Lu, Y) compounds studied by Mössbauer spectroscopy
A. Błachowski 1, K. Ruebenbauer 1, J. Przewoźnik 2, J. Żukrowski 2, D. Sitko 3, N.-T.H. Kim-Ngan 3, A.V. Andreev 4
1 Mössbauer Spectroscopy Division, Institute of Physics, Pedagogical University, Kraków, Poland
2 Solid State Physics Department, Faculty of Physics and Applied Computer Science,
AGH University of Science and Technology, Kraków, Poland
3 Surface Physics Division, Institute of Physics, Pedagogical University, Kraków, Poland
4 Institute of Physics, Academy of Sciences, Prague, Czech Republic
R2Fe17
R2Fe14Si3
Y Ce Nd Sm Gd Tb Dy Ho Er Tm Lu
Crystal structure
4 + 1(?) iron crystallographic positions
R2-xFe14+2xSi3
Iron hyperfine sites
7 + 1(?)iron magnetic positions
X-ray powder diffraction
Crystallographic Magnetic
R2-xFe14+2xSi3
Regular iron site occupanciesContribution (at. % Fe)
Ce Nd Gd Dy Ho Er Lu Y
C
ontr
ibut
ion
(at.
% F
e)
mmcPmR /6 3 3
6c 4f
9d 6g
18f or 18h 12j or 12k
18h or 18f 12k or 12j
R2-xFe14+2xSi3
Non-stoichiometry parameter2x
Ce Nd Gd Dy Ho Er Lu Y
R2-xFe14+2xSi3
Conclusions
Si atoms avoid
6c (4f) and 9d (6g) sites for R3m (P63/mmc) structure.
Fe atoms partly replace R atoms
on 6c-R (2b) sites for R3m (P63/mmc) structure forming 12e (4e) dumbbells.
Non-stoichiometry parameter
x = 0.25(5) for all compounds investigated.
