A NEUTRON DIFFRACTION DETERMINATION OF SHORT RANGE ORDER IN A Ni63.7Zr36.3 GLASS

R. Bellissent , J. Bigot , Y. Calvayrac , S. Lefebvre , A. Quivy

A precise determination of the three partial structure factors for the eutectic composition Ni63.7Zr36.3 has been carried out using neutron diffraction on three isotopically substituted glasses. The use of a "zero alloy" yields a direct determination of the Bhatia-Thornton structure factor SCC. Evidence for the existence of strong chemical short-range order and a clear size effect is obtained. Due to this chemical order, the partial structure factors cannot be consistent with the ones calculated for a two components system of hard spheres using the Percus-Yevick equation. Due to the size effect, a short-range order Warren-Cowley parameter cannot be calculated. The deviation from a purely statistical distribution around a nickel is compared to the results recently published for two other Ni-Zr glasses.

Domaines: Articles anciens

R. Bellissent, J. Bigot, Y. Calvayrac, S. Lefebvre, A. Quivy. A NEUTRON DIFFRACTION DETERMINATION OF SHORT RANGE ORDER IN A Ni63.7Zr36.3 GLASS. Journal de Physique Colloques, 1985, 46 (C8), pp.C8-87-C8-92. ⟨10.1051/jphyscol:1985809⟩. ⟨jpa-00225139⟩