High-temperature creep and kinetic decomposition of Ni2SiO4 |
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Authors: | J Wolfenstine D L Kohlstedt |
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Institution: | 1. Department of Materials Science and Engineering, Cornell University, 14853, Ithaca, NY, USA 3. Department of Geology and Geophysics, University of Minnesota, 55455, Minneapolis, MN, USA
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Abstract: | To investigate high-temperature creep and kinetic decomposition of nickel orthosilicate (Ni2SiO4), aggregates containing 3 vol% amorphous SiO2 have been deformed in uniaxial compression at a total pressure of one atomsphere. Twenty-three samples with grain sizes (d) from 9 to 30 m were deformed at temperatures (T) from 1573 to 1813 K, differential stresses () from 3 to 20 MPa, and oxygen fugacities (f
o
2) from 10-1 to 105 Pa. At temperatures up to 1773 K, the steady-state creep rate () can be described by the flow law
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