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- W2071492839 abstract "Systematic relationships between high-temperature plasticity and crystal structure are explored for dense oxides with crystal structures relevant to the Earth's mantle. Broad systematic relationships are found when the temperature and the flow stress are normalized respectively by the melting temperature and the shear modulus. However, the systematic relationships are not universal but depend on crystal structure. The rock salt structure has the lowest normalized creep strength and the garnet structure has the highest. The olivine, spinel, and perovskite structure have similar normalized creep strengths which lie between those of the rock salt and garnet structures. The creep strength of these dense oxides is found to be correlated with the length of the Burgers vector, but not with the diffusion coefficients of the slowest diffusing species. This result suggests the importance of dislocation core structures in determining the creep strength. The present result indicates that when estimating the creep strength (viscosity) of the Earth's deep interior, the effect of change in crystal structure must be explicitly taken into account as well as the depth variation of melting temperature and of shear modulus. Some geophysical implications are discussed." @default.
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- W2071492839 date "1989-06-01" @default.
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- W2071492839 title "Plasticity-crystal structure systematics in dense oxides and its implications for the creep strength of the Earth's deep interior: a preliminary result" @default.
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- W2071492839 doi "https://doi.org/10.1016/0031-9201(89)90071-x" @default.
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