Author/Authors :
Havela، نويسنده , , L. and Miliyanchuk، نويسنده , , K. and Gonçalves، نويسنده , , A.P. and Waerenborgh، نويسنده , , J.C. and Pereira، نويسنده , , L.C.J. and Gaczynski، نويسنده , , P. and Lopes، نويسنده , , E.B. and Pe?i?ka، نويسنده , , J.، نويسنده ,
Abstract :
The uranium Laves phase UFe2 was prepared by ultrafast cooling, which allows to incorporate excessive Fe of about 0.3 Fe/f.u. into the nanocrystalline Laves phase structure. 57Fe Mössbauer spectroscopy reveals that such Fe atoms occupy the U sites. Stronger magnetic hyperfine field points to larger Fe moments of such antistructure Fe. Higher Fe excess leads to its segregation in the form of α-Fe. The Curie temperature of the UFe2+x phase increases to the limit value 230–240 K.
Keywords :
F. Spectroscopic methods , A. Magnetic intermetallics , A. Laves phases , B. Magnetic properties , A. Nanostructured intermetallics
