2018
DOI: 10.1016/j.epsl.2017.12.020
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Mg lattice diffusion in iron-free olivine and implications to conductivity anomaly in the oceanic asthenosphere

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Cited by 27 publications
(75 citation statements)
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“…Obviously, DFeMggbis estimated to be around four orders faster than DFeMglat. At temperature from 1,373 to 1,873 K, 3δDFeMggb/d is significantly enhanced with decreasing grain size, which is consistent with the grain size‐dependent phenomena in forsterite when d < 1 μm (Fei et al, , ). Furthermore, a comparison of our calculated grain size‐dependent D Fe‐Mg in ringwoodite with that in wadsleyite estimated using data from Kubo et al () revealed that the effective diffusivity between them is consistent in the whole temperature range investigated (Figure ).…”
Section: Discussionsupporting
confidence: 58%
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“…Obviously, DFeMggbis estimated to be around four orders faster than DFeMglat. At temperature from 1,373 to 1,873 K, 3δDFeMggb/d is significantly enhanced with decreasing grain size, which is consistent with the grain size‐dependent phenomena in forsterite when d < 1 μm (Fei et al, , ). Furthermore, a comparison of our calculated grain size‐dependent D Fe‐Mg in ringwoodite with that in wadsleyite estimated using data from Kubo et al () revealed that the effective diffusivity between them is consistent in the whole temperature range investigated (Figure ).…”
Section: Discussionsupporting
confidence: 58%
“…This observation is similar to that reported in wadsleyite (Kubo et al, ) and garnet (Zhang et al, ). However, the water exponent for D Fe‐Mg in ringwoodite ( r = 0.25) is smaller than that in olivine ( r ≈ 0.9, Hier‐Majumder et al, ) and Mg diffusion in forsterite both within the lattice ( r ≈ 1.2, Fei et al, ) and along the grain boundaries ( r ≈ 1.0, Fei et al, ) and in garnet ( r ≈ 1.38, Zhang et al, ).…”
Section: Discussionmentioning
confidence: 99%
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“…It has been proposed that olivine has three electrical conduction mechanisms (e.g., Yoshino et al, 2009): (a) proton conduction with charges carried by protons (H i ● ) produced by (2H) Mg × <=> H Mg ′ + H i ● owing to the small amount of H 2 O (protons) incorporated in the crystal structure as point defects; (b) small polaron conduction caused by hopping of electron holes (h ● ) between ferrous and ferric iron, that is, Fe 3+ <=> Fe 2+ + h ● , with h ● as the charge carrier; and (c) ionic conduction controlled by the diffusion of ions between regular sites and vacancies, A A × (site 1) + V A (site 2) <=> V A (site 1) + A A × (site 2), where A A × is the regular site of element A (Mg, Fe, Si, and O) and V A is the corresponding vacant site. Mechanism (c) is dominated by Mg (Fe) diffusion because it is by orders of magnitude faster than Si and O in olivine (Chakraborty et al, 1994; Fei et al, 2013, 2014; Fei et al, 2018a). The charge carrier of ionic conduction is specialized to vacancies on regular sites (also called vacancy conduction; e.g., Gardés et al, 2014), although protons in olivine are also ionic species.…”
Section: Introductionmentioning
confidence: 99%