Poisson’s Ratio and the Densification of Glass under High Pressure

Abstract

Because of a relatively low atomic packing density, ($C_g$) glasses experience significant densification under high hydrostatic pressure. Poisson’s ratio ($\nu$) is correlated to $C_g$ and typically varies from 0.15 for glasses with low $C_g$ such as amorphous silica to 0.38 for close-packed atomic networks such as in bulk metallic glasses. Pressure experiments were conducted up to 25 GPa at 293 K on silica, soda-lime-silica, chalcogenide, and bulk metallic glasses. We show from these high-pressure data that there is a direct correlation between $\nu$ and the maximum post-decompression density change.