Nature research paper: Periclase deforms more slowly than bridgmanite under mantle conditions
and confirm that, under laboratory conditions, bridgmanite is indeed expected to be stronger than ferropericlase. It should be noted that the flow stress value for ferropericlase corresponds to a very high hardening and that under more ‘gentle’ laboratory deformation conditions , the rheology contrast under laboratory conditions should be even larger.
. The effective viscoplastic behaviour can be expressed with a nonlinear creep law with a stress sensitivity
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