Plasticity of MGSIO3perovskite: The results of microhardness tests on single crystals
作者:
Shun‐ichiro Karato,
Kiyoshi Fujino,
Eiji Ito,
期刊:
Geophysical Research Letters
(WILEY Available online 1990)
卷期:
Volume 17,
issue 1
页码: 13-16
ISSN:0094-8276
年代: 1990
DOI:10.1029/GL017i001p00013
数据来源: WILEY
摘要:
The Plasticity of single crystals of MgSiO3perovskite was studied (at room temperature) by the microhardness tests using a Vickers and a Knoop indenter. The Vickers hardness, Hv, of MgSiO3perovskite 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, Hv/μ (μ: shear modulus), of MgSiO3perovskite is in reasonable agreement with those of titanate perovskites (SrTiO3, BaTiO3, CaTiO3), although a cubic perovskite SrTiO3has a significantly lower hardness than others. The Knoop tests showed anisotropic hardness consistent with the slip system
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