Physics – Geophysics
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pepi...87...77z&link_type=abstract
Physics of the Earth and Planetary Interiors (ISSN 0031-9201), vol. 87, no. 1-2, p. 77-83
Physics
Geophysics
5
Acoustic Velocity, Aluminum Oxides, Compression Waves, Doped Crystals, Pressure Dependence, S Waves, Seismic Waves, Seismology, Vibrational Spectra, Acoustic Measurement, Geophysics, Pressure Effects, Velocity Measurement
Scientific paper
The shear velocity of vs of Cr(3+)-doped Al2O3 has been derived from measurements of the transverse acoustic mode in the vibrational sideband spectrum to 616 kbar, increasing the pressure range of sound velocity measurements nearly two orders of magnitude. The pressure dependence of the shear modulus G=1638+1.78 (P/kbar)-5.2 times 10-4 (P/kbar)2, in excellent agreement with previous lower pressure ultrasonic studies. The compressional velocity was calculated from vp = (KS/rho + (4/3) V21/2, where KS is determined from previous compressional studies. Both shear and compressional velocities vary linearly with compression over the entire pressure range of this study. The geophysically important parameter (partial differential ln partial differential ln v)T is found to increase with pressure by (partial differential ln rho partial differential ln vs)T =1.03+2.53 ln (rho/rho0)T and (partial differential ln rho/partial differential ln vp)T =0.75+0.39 ln (rho/rho0)T.
Chopelas A.
Zhang Lianchang
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