Diffusion of aluminum in MgO: A thermodynamic approach study

Abstract

We have applied a thermodynamical model to calculate the diffusion coefficient of aluminum in MgO with the aid of bulk elastic properties. Our calculated diffusivities as a function of temperature and pressure are compared with the existing results derived from experimental or theoretical investigations. We find that the present model provides a satisfactory estimation for the activation volume and the activation enthalpy.

Germanium diffusion in aluminium: connection between point defect parameters with bulk properties

“…In the single experimental measurement method the calculated value of will be affected on the errors in the preexponential factor, B, Ω, and D1 values, and these can be significant when a single experimental values set is considered. To validate the present results and avoid the dependence of on the experimental uncertainties the mean value method is also considered here [38][39][40][41][42][43]. As mentioned previously the linear behaviour of …”

“…As discussed in previous studies the method of the single experimental measurement (refer to [14,15] and references therein) is not unique and methods such as the so-called compensation law [38,39] and the "mean value" method (MV) [40][41][42] have been used to calculate . In the single experimental measurement method the calculated value of will be affected on the errors in the preexponential factor, B, Ω, and D1 values, and these can be significant when a single experimental values set is considered.…”

Effect of heat treatment of magnesium alloy substrates on corrosion resistance of a hybrid organic–inorganic sol–gel film

“…In Mg-Al Alloys, diffusion rates of Mg and Al ions may inuence their concentration in the oxide lm formed on the alloy surface. Recent data in the literature, 36,37 suggest that in the MgO (periclase) trivalent cations diffuse rapidly compared to divalent cations, behaviour arising from the coulombic attraction between trivalent cations and cation vacancies; for this reason diffusion of Al 3+ can be one order of magnitude faster than Mg 2+ at the same conditions. This could favour the increases in Al concentration highlighted in the paper.…”

Thermodynamic estimation the compressibility of ferropericlase under high pressure

“…This model has been successfully applied to calculate point-defect processes as well as self-diffusion and hetero-diffusion parameters within a wide range of materials, [18][19][20][21][22][23][24][25][26] and in various minerals with geophysical applications. [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] When this relation is differentiated with respect to pressure…”