Mössbauer Study of Amorphous and Crystalline YFe₂

Abstract

The Mössbauer effect of ⁵⁷Fe in amorphous and crystalline YFe₂ was measured from 77 K to 700 K. The average value of the quadrupole splitting in amorphous YFe₂ below 400 K is nearly equal to the extrapolated value from the paramagnetic state of crystalline YFe₂. The temperature dependence of absorption intensity follows the Debye model in amorphous YFe₂. The ratio of the Debye temperature in amorphous state to crystalline state is 0.80±0.05 for YFe₂. The isomer shift in amorphous state is smaller than that in crystalline state and increases with increasing temperature up to the value of the crystalline state.