The temperature sensitivity of elastic wave velocity at high pressure: New results for molybdenum

Abstract

Abstract.A new experimental technique is described whereby a material is heated to very high temperature (T), shock compressed to high pressure (P) (and higher T), and the compressional elastic wave velocity of the high P and T state is measured. This method has been applied to the high-pressure standard molybdenum at pressures between 12 and 81 GPa and at an initial temperature of 1400øC. The compressional velocity of Mo at 2450øC and 81 GPa is found to be 7.9! kin/s, compared to a calculated value of 8.36 km/s at 81 GPa along the 25øC isotherm. Data for molybdenum, a number of other metals, and a silicate yield a consistent trend which can be used to determine the scaling coefficient between compressional velocity and temperature at geophysically relevant conditions.

A High-Order Godunov Method for Multiple Condensed Phases

“…2 In this study we will assume the molybdenum container has zero material strength. Although this is inconsistent with experiment [18], it is an adequate assumption for the purpose of assessing the feasibility of melt illustrated in Fig. 13, which are currently being conducted by the first author for the purpose of determining the sound speed measurement.…”

“…In our computations we have used ϭ 0.1. This adds diffusive dissipation when there is a shock, regardless of the orientation of the i ϭ Ά 0 i fzϾz 1 ; 18) shock with respect to the direction of integration. However, the inclusion of a transverse velocity gradient in means that artificial viscosity will not be employed at slip lines oblique to the computational grid.…”