Thermal expansion of bulk amorphous Zr<inf>41.2</inf>Ti<inf>13.8</inf>Cu<inf>12.5</inf>Ni<inf>10</inf>Be <inf>22.5</inf> alloy

The linear thermal expansion of the bulk amorphous Zr41.2Ti13.8Cu12.5Ni10Be 22.5 (atomic percent) alloy has been measured from 80 K to 773 K. The data for T < Tg were fitted by a model based on the Grüneisen relation and a Debye expression for the heat capacity. From the fit, we deduced the Griineisen parameter, γ = 1.25, and the Debye temperature, ΘD = 400 K. Annealing the amorphous alloy at 663 K, which is between the glass transition temperature Tg = 623 K and the crystallization temperature Tx = 693 K, causes viscous flow in the sample. This is due to the small viscosity in the undercooled liquid.