Boron diffusion in forsterite
WebDec 1, 2024 · From defects to diffusion. The self-diffusion of Mg by a vacancy mechanism can be represented by: (3) D Mg sd − vac = D Mg Vac N Vac. Where DMgVac is the … WebJan 16, 2013 · 8. Diffusivity of Boron and Gallium in silicon as a function of the normalized hole concentration. The linear trend over almost three orders of magnitude indicates that the mobile B I pair is in the neutral charge …
Boron diffusion in forsterite
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Webboundary diffusion coefficients of silicon and oxygen in olivine as a function of pressure, temperature, and water content, and investigated the upper mantle rheology based on silicon and oxygen diffusion rates. (1) Silicon lattice diffusion coefficient in dry forsterite WebNov 1, 2003 · This implantation-induced transient-enhanced diffusion is known to be driven by the large supersaturation of self-interstitial silicon atoms emitted from the extended defects. The form and evolution of implantation-induced defects with respect to implant species, energy, dose, and annealing temperature have been systematically studied.
WebNov 7, 2024 · Forsterite is a magnesium silicate crystal with the chemical formula Mg 2 SiO 4 derived from the olivine mineral group [ 1 ]. Olivine is a group of minerals composed of iron (Fe) and magnesium (Mg). The olivine mineral is green, with luster, formed at high temperatures. This mineral is commonly found in basalt and ultramafic rocks. WebMay 25, 2024 · Boron is an important tracer in the mantle but its fate during deep subduction is poorly constrained. In this work we use density functional theory and a …
WebSep 8, 2015 · We discuss the experimental results of silicon and oxygen self-diffusion coefficients in forsterite and iron-bearing olivine from the perspective of defect … WebOxygen self-diffusion coefficients for forsterite single crystals were determined in different orientations by the single-spectrum proton activation technique. In the temperature range 1275°-1625°C the diffusion coefficients in b direction can be represented by D b = 3.5 × 10 -3 exp [ (-89 ± 3 kcal/mol)/RT] cm 2 /s. Publication:
WebCompared with data for silicon diffusion in forsterite, our data indicate that oxygen is not the slowest diffusing species in olivine. The activation energy for oxygen diffusion is also low compared to that obtained in a majority of measurements of creep in …
http://minsocam.org/MSA/Ammin/AM_Preprints/6480FeiPreprintSep.pdf dallas marathon race courseWebExperimentally, silica activity (aSiO 2) has been shown to have an effect on Mg diffusion in forsterite, but no fully satisfactory mechanism has yet been proposed.We calculated the effects of aSiO 2 and aluminium content (the main contaminant in some recent experimental studies), and their co-effect, on Mg diffusion in forsterite, using thermodynamic … dallas marathon race rosterWebOct 1, 2014 · The three diagnostic OH bands can be used as a signature of H associated with boron substitution in olivine and forsterite, leading to a quantitative analysis of their … dallas marathon relay 2022WebOct 4, 2014 · We systematically measured oxygen self-diffusion coefficients (D O) in forsterite along b crystallographic axis at a pressure of 8 GPa and temperatures of 1600–1800 K, over a wide range of water content (C H2O) from <1 up to ~800 weight ppm.The experimental results suggest that D O ∝ (C H2O) 0.05±0.06 ≈ (C H2O) 0.Thus, … birch plantWebJan 16, 2013 · 8. Diffusivity of Boron and Gallium in silicon as a function of the normalized hole concentration. The linear trend over almost three orders of magnitude indicates that the mobile B I pair is in the neutral charge … dallas marathon race resultsWebJul 9, 2014 · A tube with a packed bed of forsterite and exposed at one end to a solution in equilibrium with 100 bar of CO 2 at 100 °C was used to explore the timing and spatial … birch planters and containersWeb30 Mg grain-boundary diffusion; forsterite; upper mantle. 31 1. Introduction 32 (Mg,Fe) 2 SiO 4 olivine is one of the most important minerals, which constitutes about 60 vol.% of 33 the Earth’s upper mantle (Ringwood 1991), and forsterite is the Mg-rich endmember of olivine 34 (Fo100-90). dallas marathon 5k