Equation of state of ${\mathrm{Zr}}_{41}{\mathrm{Ti}}_{14}{\mathrm{Cu}}_{12.5}{\mathrm{Ni}}_{10}{\mathrm{Be}}_{22.5}$ bulk metallic glass

The pressure-volume $\mathrm{}(P-V)\mathrm{}$ relation of ${\mathrm{Zr}}_{41}{\mathrm{Ti}}_{14}{\mathrm{Cu}}_{12.5}{\mathrm{Ni}}_{10}{\mathrm{Be}}_{22.5}$ bulk metallic glass (BMG) at room temperature has been studied using a piston-cylinder high-pressure apparatus up to 4.5 GPa. The equation of state of the BMG is determined. As the first equation of state of the BMG, it is compared with other crystalline solids, and the differences are phenomenologically explained. The experimental results indicate the BMG contains a large amount of vacancylike free volume.