| NUKLEONIKA 2003, 48(Supplement 1):s79-s83
EFFECT OF Sc SUBSTITUTION FOR Y ON STRUCTURAL PROPERTIES AND HYPERFINE INTERACTIONS IN Y1-xScxFe2 COMPOUNDSMieczysław Budzyński, Jan Sarzyński, Marek Wiertel, Zbigniew Surowiec Institute of Physics, Maria Curie-Skłodowska University, 1 M. Curie-Sklodowska Sq., 20-031 Lublin, Poland Measurements of X-ray diffraction and Mössbauer effect were made on a series of Y1-xScxFe2 polycrystalline samples (x = 0.0, 0.2, 0.5, 0.7, 0.8, 1.0). It was found that the system has the cubic MgCu2 structure except for x = 1.0 where hexagonal MgZn2 structure type is stable. The lattice constant decreases with increasing x. The results of Mössbauer effect study at room temperature show that the easy axes of magnetization remain in the <111> direction for the cubic samples and <100> for the hexagonal one. Curie temperatures TC were determined from temperature dependence of the hyperfine magnetic fields. The concentration dependence of the hyperfine fields and TC show similar trends, exhibiting a maximum at x = 0.8. The magnetic and structural behaviour show that, in spite of being isoelectronic, the substitution of Y by Sc induces clear changes in the structural and magnetic properties of the compounds under investigation. Close X |