"Negative'' Pressures, Clusters, and Stiffness Thresholds in Non-Crystalline Network Solids.

Non-crystalline alloys A sub x B sub (1-x) exhibit stiffness thresholds x sub c (transport properties at high P) and x tilde sub c (other properties at P = 0). Differences between x sub c, x tilde sub c and theory are explained microscopically.