B. Effey et Rl. Cappelletti, Neutron inelastic scattering study of Se-As-Ge glasses: A test of the vibrational isocoordinate rule, PHYS REV B, 59(6), 1999, pp. 4119-4124
Determinations of the generalized neutron vibrational density of states (GV
DOS) made on samples of Se-As-Ge glass alloys by neutron inelastic scatteri
ng at the NIST Center for Neutron Research are presented. It is observed th
at up to a certain characteristic vibrational energy the GVDOS are nearly i
dentical for alloys over a broad range of compositions as long as they have
the same average coordination number [r]. In the present work this feature
, referred to as the vibrational isocoordinate rule (VIR), is established f
or samples of Se-As-Ge alloys over the entire glass-forming region with [r]
ranging from 2.16 through the theoretical rigidity percolation threshold 2
.4 up to 3.2. Compositional exceptions to the VIR have been found along and
near the Se-As binary alloy line above [r] = 2.4. [S0163-1829(99)12105-2].