  An amorphous Ti50Ni25Cu25 alloy was produced by 19 h of mechanical alloying.
Anomalous wide angle x-ray scattering data were collected at six energies and
six total scattering factors were obtained. By considering the data collected
at two energies close to the Ni and Cu K edges, two differential anomalous
scattering factors around the Ni and Cu atoms were obtained, showing the
chemical environments around these atoms are different. The eight factors were
used as input data to the reverse Monte Carlo method used to compute the
partial structure factors STi-Ti(K), STi-Cu(K), STi-Ni(K), SCu-Cu(K), SCu-Ni(K)
and SNi-Ni(K). From their Fourier transformation, the partial pair distribution
functions GTi-Ti(r), GTi-Cu(r), GTi-Ni(r), GCu-Cu(r), GCu-Ni(r) and GNi-Ni(r)
were obtained, and the coordination numbers and interatomic atomic distances
for the first neighbors were determined.
