The temperature sensitivity of elastic wave velocity at high pressure: New results for molybdenum
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 1400°C. The compressional velocity of Mo at 2450°C and 81 GPa is found to be 7.91 km/s, compared to a calculated value of 8.36 km/s at 81 GPa along the 25°C 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.
Copyright 1994 by the American Geophysical Union. (received November 10, 1993; accepted December 13, 1993.) Paper number 94GL(X)223. We thank R. Jeanloz, P. Silver, C. Bina, M. Manghnani, and D. L. Anderson for constructive comments and M. Furnish for providing us with copies of his data. This work was supported by the NSF. Division of Geological and Planetary Sciences, California Institute of Technology contribution 5197.
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