Plasticity of M G S I O 3  perovskite: The results of microhardness tests on single crystals | Zendy

Karato Shunichiro | Zendy; Fujino Kiyoshi | Zendy; Ito Eiji | Zendy

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Plasticity of M G S I O 3 perovskite: The results of microhardness tests on single crystals

Author(s) -

Karato Shunichiro,

Fujino Kiyoshi,

Ito Eiji

Publication year - 1990

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/gl017i001p00013

Subject(s) - knoop hardness test , materials science , vickers hardness test , indentation hardness , mineralogy , perovskite (structure) , enstatite , plasticity , composite material , shear modulus , anisotropy , crystallography , microstructure , geology , optics , chemistry , physics , meteorite , astronomy , chondrite

The Plasticity of single crystals of MgSiO 3 perovskite was studied (at room temperature) by the microhardness tests using a Vickers and a Knoop indenter. The Vickers hardness, H v , of MgSiO 3 perovskite was determined to be 18 +/− 2 GPa, about a factor of two larger than the hardness of either enstatite or olivine, indicating a significantly larger resistance to plastic flow of this mineral than that of the upper mantle minerals. The normalized hardness, H v /μ (μ: shear modulus), of MgSiO 3 perovskite is in reasonable agreement with those of titanate perovskites (SrTiO 3 , BaTiO 3 , CaTiO 3 ), although a cubic perovskite SrTiO 3 has a significantly lower hardness than others. The Knoop tests showed anisotropic hardness consistent with the slip systems .

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