Computer Science – Sound
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..237c&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 3, p. 237-240.
Computer Science
Sound
2
Amorphous Materials, Compression Waves, Hugoniot Equation Of State, Phase Transformations, Shock Waves, Feldspars, High Pressure, Poisson Ratio
Scientific paper
Compressional wave velocities as a function of pressure have been measured in pressure-amorphized anorthite to 14 GPa at room temperature. A weighted linear fit to the data gives a zero-pressure value of V(p) = 6.35 +/- 0.12 km/s, with a slope of 0.154 +/- 0.016 km/s/GPa. It is shown that these compressional wave velocities compare well with bulk sound speeds inferred from shock-wave experiments on anorthite above the phase transition at 30 GPa, assuming a value of Poisson's ratio in the range of 0.15 to 0.20. All crystalline assemblages which have been suggested as high-pressure phases of anorthite are shown to possess zero-pressure bulk sound speeds in the range 6.9 km/s to 8.1 km/s, well above the value of 5 km/s extrapolated from the shock-wave data. It is therefore proposed that the shock Hugoniot of anorthite above 30 GPa represents the properties of the pressure-amorphized phase, rather than those of the equilibrium high-pressure phases.
Campbell Andrew
Heinz Dion
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