Physics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17...13k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, Jan. 1990, p. 13-16. Research supported by the Development and Evolution
Physics
19
Hardness Tests, Magnesium Oxides, Microhardness, Perovskites, Plastic Properties, Single Crystals, Electron Microscopy, Geochemistry, Planetary Composition, Silicon Oxides, X Ray Analysis
Scientific paper
The plasticity characteristics of single crystals of MgSiO3 perovskite, grown from the melt were investigated by means of microhardness tests using a Vickers indenter and, in some cases, a Knoop indenter on a polished surface. The results were compared with data obtained on two titanate perovskites, SrTiO3 and CaTiO3. The Vickers hardness, H(V), of MgSiO3 perovskite was determined to be 18 + or - 2 GPa. This is about a factor or two larger than the H(V) of enstatite or olivine, indicating a significantly higher resistance to plastic flow of MgSiO3, which constitutes 70 to 100 percent of the lower mantle, than of the upper mantle minerals. The normalized hardness, H(V)/shear modulus (mu), of MgSiO3 perovskite was found to be close to the H(V)/mu values exhibited by the two titanate perovskites.
Fujino Kiyoshi
Ito Eiji
Karato Shun-Ichiro
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