Portal de Periódicos da CAPES

Shock compression of two iron-silicon alloys to 2.7 megabars

1966; American Geophysical Union; Volume: 71; Issue: 14 Linguagem: Inglês

10.1029/jz071i014p03577

2156-2202

A. S. Balchan, George R. Cowan,

Earthquake Detection and Analysis

The compressibility of iron-silicon alloys of 4.0 and 19.8 wt % silicon has been measured to 2.7 Mb, using a plane-wave explosive-metal driver system. A high-resolution electrical pin contactor method was developed for the measurement of shock wave velocity in the alloy samples. The Gruneisen equation of state was used in calculating temperature and sound speed along the measured Hugoniot of the 19.8 wt % alloy and in constructing a family of isentropes from the measured quantities. The loci of pressure-density and sound speed-density values for the 19.8 wt % alloy along the Hugoniot and isentropes were compared with estimates of these properties for the earth's core. The results are consistent with an outer core containing 14–20 wt % silicon in iron, as has been proposed by Kingwood and by MacDonald and Knopoff.