Abstract
Inelastic neutron scattering measurements are reported on the amorphous (a) transition-metal--metalloid alloys of a-${\mathrm{Ni}}_{82}$${\mathrm{B}}_{18}$, a-${\mathrm{Ni}}_{67}$${\mathrm{B}}_{33}$, and the crystalline (c) compound, c-${\mathrm{Ni}}_{2}$B. The spectra provide information about changes in the vibrational density of states with composition and upon crystallization. The results of the crystalline-to-amorphous comparison for the 67 at. % Ni samples, show dramatic changes in the vibrational spectra, including an increase in the number of states, both at low and high energies, in the amorphous sample. The differences in the high-energy states are attributed to a change in short-range order between the amorphous and crystalline compositions. The similarities between the 67 at. % Ni and 82 at. %Ni samples are consistent with a similar short-range order in the two alloys, as well as comparable transition-metal--transition-metal and transition-metal--metalloid interactions. No evidence for any appreciable, direct metalloid-metalloid bonding in the high-metalloid-content samples has been found.
Published Version
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