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Mössbauer effect studies of Dy(Mn0.4-xAlxFe0.6)2 intermetallics

Stoch P., Pszczoła J., Guzdek P., Jabłońska A., Suwalski J., Dąbrowski L., Pańta A.

Nukleonika

2004

Vol. 49,suppl.3

23-25

Both 3d subbands in the Dy(Mn0.4Fe0.6)2 compound are filled up only partially with 3d electrons. So, it was interesting to study the consequence of Mn/Al substitution in the Dy(Mn0.4 xAlxFe0.6)2 series. The cubic, MgCu2-type, Fd3m crystal structure was observed across the series. However, for x = 0.35 and 0.40 a stoichiometric admixture of the hexagonal, MgZn2-type, P63/mmc structure was evidenced. Mössbauer effect measurements at 57Fe nuclei were performed at 77 K. The magnetic hyperfine field decreases vs. the aluminium content x. This dependence is related to the possible 3d-electron band structure.

Mössbauer effect studies of Dy(Fe0.7-xNixCo0.3)2 intermetallics

Jabłońska A., Suwalski J., Pszczoła J., Guzdek P., Stoch P., Pańta A.

Nukleonika

2004

Vol. 49,suppl.3

85-88

Abstract A consequence of the Fe/Ni substitution in the series of Dy(Fe0.7 xNixCo0.3)2 was studied in the presented paper. The synthesis and X-ray analysis (300 K) of the Dy(Fe0.7 xNixCo0.3)2 system were performed. The cubic, MgCu2-type, Fd3m crystal structure was evidenced for this solid solution. 57Fe Mössbauer effect measurements for the system were carried out at 77 K. The obtained crystallographic lattice parameters and the hyperfine interaction data are presented. The magnetic hyperfine field values form a separate branch of the Slater-Pauling curve situated above the branch corresponding to the Dy(Fe1 xCox)2 intermetallics.