| NUKLEONIKA 2013, 58(1):173-178
STRUCTURAL AND MAGNETIC PROPERTIES OF Sc(Fe1-xCux)2 COMPOUNDS STUDIED BY MEANS OF MOSSBAUER EFFECT
AND NEUTRON DIFFRACTION
Marek Wiertel1, Zbigniew Surowiec1, Mieczysław Budzyński1, Jan Sarzyński1,
Anatoly I. Beskrovnyi2
1 Maria Curie-Skłodowska University, Institute of Physics,
1 M. Curie-Skłodowskiej Sq., 20-031 Lublin, Poland
2 Joint Institute for Nuclear Research, Frank Laboratory of Neutron Physics,
141980 Dubna, Russia
The subject of the investigations were quasibinary Sc(Fe1-xCux)2 Laves phases in which structural and magnetic properties depend on replacement of Fe atoms by Cu atoms. Powder X-ray diffraction and neutron diffraction measurements carried out at room temperature revealed that samples were a mixture of two phases: the quasibinary Sc(Fe1-xCux)2 compounds with cubic C15 structure and ScCu2 with tetragonal structure. 57Fe Mössbauer spectroscopy revealed that the Sc(Fe1-xCux)2 compounds are ferrimagnetic up to an actual concentration xact < 0.30. A decreasing
of mean values of hyperfine magnetic fields was observed. On the basis of analysis of the neutron diffraction spectra the mean values of Fe magnetic moments were determined, considering the component connected with the quasibinary Sc(Fe1-xCux)2 phases. These moments change from 1.45(29) µB in the Sc(Fe0.92Cu0.08)2 to 1.18(32) µB in Sc(Fe0.72Cu0.28)2 phase at 8 K. From the results of independent hyperfine magnetic field on 57Fe probes and magnetic Fe moments measurements, the hyperfine coupling constant in quasibinary ferrimagnetic Sc(Fe1-xCux)2 phases is estimated as equal to 13 T/µB at room temperature.
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