Physics
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.3261m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, April 10, 1988, p. 3261-3269. NSF-supported research.
Physics
62
Magnesium Oxides, Polycrystals, Shear Stress, Single Crystals, Yield Strength, Low Temperature, Plastic Flow, Pressure Dependence, Sodium Chlorides
Scientific paper
The strength of MgO is measured over a pressure range extending well into that of the lower mantle. By modeling the nonhydrostatic stress state in a diamond cell, it is shown how measurements of the pressure gradients at high pressures can be used to derive a good estimate of the maximum shear stress across a sample under quasi-static conditions. The critical resolved shear stress for slip on the 110-plane/0-10-line and 100-plane/0-11 line systems at high pressures are constrained, and the yield stress for polycrystalline MgO is measured to 40 GPa. Contrary to the conclusions of previous studies, it is found that the yield strength is pressure-dependent over the entire experimental pressure range. The data still support conservative models of early core formation in accreting planetesimals in which the yield strength of a cold accreting earth would be sufficiently low that dense core-forming phases could sink quickly to the center.
Jeanloz Raymond
Meade Charles
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