Physics
Scientific paper
Dec 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973pepi....7..461l&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 7, Issue 4, p. 461-465.
Physics
10
Scientific paper
Polycrystalline aggregates of SnO2-cassiterite and GeO2-rutile have been hot-pressed in a piston-cylinder apparatus at P = 30 kbar and T <= 1,000°C. These specimens are less than 2% porous and less than 20μ in grain size. Compressional (Vp) and shear (Vs) velocities are determined as a function of pressure to 7.5 kbar at 293 K by the ultrasonic-pulse superposition method. Extrapolation of the velocity-pressure data to P = 1 ba yields the following velocities (units: km/sec) for the compressed polycrystalline aggregate SnO2: Vp = 6.91, Vs = 3.75; for GeO2: Vp = 8.56, Vs = 4.83. Comparison with published data for single-crystal GeO2 indicates that our specimen is elastically isotrop within 1%. The bulk sound velocities (Vφ) for the rutile minerals SiO2, GeO2 and SnO2 are systematically related to density, with TiO2 being anomalous. Shankland's (1972) equation (∂ ln Vφ/∂ ln M)x = - 1/2 (where M is mean atomic weight) represents these rutile data well.
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