TY - JOUR
T1 - Silicon self-diffusion in MgSiO3 perovskite at 25 GPa
AU - Yamazaki, Daisuke
AU - Kato, Takumi
AU - Yurimoto, Hisayoshi
AU - Ohtani, Eiji
AU - Toriumi, Mitsuhiro
N1 - Funding Information:
We greatly thank S. Karato for encouragement, useful discussions and some experimental supports. I am indebted to K. Onuma for the useful discussions, A. Suzuki and M. Ito for the experimental supports, K. H. Lee for technical supports of EBSP works, H. Horiuchi for the use of the micro-area X-ray diffractometer and M. Ozima for providing enstatite. O. Jaoul and an anonymous referee are thanked for their reviewing. D. Yamazaki has been supported by Research Fellowships of the Japan Society for the Promotion of Science for Young Scientists.
PY - 2000/5
Y1 - 2000/5
N2 - Silicon self-diffusion coefficients in MgSiO3 perovskite were measured under lower mantle conditions. The MgSiO3 perovskite was synthesized and diffusion annealing experiments were conducted at pressure of 25 GPa and temperature of 1673-2073 K using a MA8 type high-pressure apparatus. The diffusion profiles were obtained by secondary ion mass spectrometry. The lattice and grain boundary diffusion coefficients (D1 and D(gb)) were determined to be D1 [m2/s] = 2.74 X 10-10 exp(-336 [kJ/mol]/RT) and δD(gb) [m3/s] = 7.12 X 10-17 exp(-311 [kJ/mol]/RT), respectively, where δ is the width of grain boundary, R is the gas constant and T is the absolute temperature. These diffusion coefficient play a key role for understanding the rheology of the lower mantle. (C) 2000 Elsevier Science B.V. All rights reserved.
AB - Silicon self-diffusion coefficients in MgSiO3 perovskite were measured under lower mantle conditions. The MgSiO3 perovskite was synthesized and diffusion annealing experiments were conducted at pressure of 25 GPa and temperature of 1673-2073 K using a MA8 type high-pressure apparatus. The diffusion profiles were obtained by secondary ion mass spectrometry. The lattice and grain boundary diffusion coefficients (D1 and D(gb)) were determined to be D1 [m2/s] = 2.74 X 10-10 exp(-336 [kJ/mol]/RT) and δD(gb) [m3/s] = 7.12 X 10-17 exp(-311 [kJ/mol]/RT), respectively, where δ is the width of grain boundary, R is the gas constant and T is the absolute temperature. These diffusion coefficient play a key role for understanding the rheology of the lower mantle. (C) 2000 Elsevier Science B.V. All rights reserved.
KW - High pressure and temperature
KW - MgSiO perovskite
KW - Rheology of the lower mantle
KW - Silicon diffusion profile
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U2 - 10.1016/S0031-9201(00)00135-7
DO - 10.1016/S0031-9201(00)00135-7
M3 - Article
AN - SCOPUS:0034086216
SN - 0031-9201
VL - 119
SP - 299
EP - 309
JO - Physics of the Earth and Planetary Interiors
JF - Physics of the Earth and Planetary Interiors
IS - 3-4
ER -