Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pepi..174..145t&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 174, Issue 1-4, p. 145-152.
Physics
3
Scientific paper
Grain-growth kinetics of (Mg0.85Fe0.15)O ferropericlase was investigated at pressures of 5 and 10 GPa and temperatures of 1673-1873 K using a Kawai-type multi-anvil apparatus. Presintered ferropericlase aggregate with an average grain size of 4.0 μm was used as starting material of grain-growth annealing experiments. The grain-growth kinetics of ferropericlase is described by Gn-G0n=ktexp[-(E*+PV*)/RT], where G is the average grain size at annealing time t, G0 the initial average grain size, P the pressure, R the gas constant and T is the absolute temperature, with n = 2.6 ± 0.4, log10 k0 = -7.5 ± 1.7 m2.6/s, E* = 262 ± 30 kJ/mol, V* = 4.7 ± 0.7 cm3/mol. Compared at same pressure and temperature, grain-growth rate of ferropericlase is similar to olivine and faster than those of wadsleyite and ringwoodite. The present results show that, at the top of the lower mantle (P = 25 GPa and T = 1773 K) grain size of ferropericlase in single phase system evolves to ˜2 × 10-2 m after significant geological time (10 My) while a previous study predicts that grain size of MgO in two-phase system is as small as ˜8 × 10-6 m at same condition.
Nishihara Yu
Tsujino Noriyoshi
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