Physics – Geophysics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pepi...32..273p&link_type=abstract
Physics of the Earth and Planetary Interiors (ISSN 0031-9201), vol. 32, June 1983, p. 273-287. Research supported by the Institu
Physics
Geophysics
49
Creep Properties, Crystal Dislocations, Earth Mantle, Electrical Resistivity, Potassium Compounds, Rheology, Viscosity, Electromagnetic Interactions, Geophysics, Magnesium Compounds, Perovskites, Single Crystals, Zinc Fluorides
Scientific paper
The high-temperature rheological and electrical behavior of single-crystal KZnF3 fluoperovskite, an analog of the MgSiO3 perovskite in the lower mantle were investigated. The crystals flow by Newtonian dislocation creep (Harper-Dorn creep), predominantly on the 100 planes. Below the melting point, solid-electrolyte behavior appears, accompanied by a weakening of the mechanical properties. Geophysical implications are examined: The lower mantle can convect by Newtonian dislocation creep and an asthenosphere may exist at the bottom of the mantle. Electromagnetic interactions between the core and solid-electrolyte lower mantle may also be important.
Brebec G.
Gesland J. Y.
Peyronneau Jean
Poirier Jean-Paul
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