Diffusivity and solubility of oxygen in solid palladium

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The solid solubility c O of oxygen in palladium in equilibrium with gaseous oxygen has been determined from absorption-desorption experiments for temperatures T of 1123 and 1173 K and oxygen partial pressures between 2.7 × 103 and 4.0 × 104 Pa. The relationship between c O, and T is given by , where R = 8.314 JK−1 mol−1 is the universal gas constant, ΔH s = −13.55 kJ/mol denotes the heat of solution of oxygen in palladium and the constant a amounts to or . The diffusion coefficient D O of oxygen in solid palladium has been determined by incomplete isothermal internal oxidation of Pd–Fe alloys using the data on the oxygen solubility in palladium. The temperature dependence of D O obeys the Arrhenius equation D O = D 0 exp(−E d/RT) with pre-exponential factor D 0 = 2.33 × 10−7 m2/s and activation energy of diffusion of oxygen in palladium, E d = 102.76 kJ/mol

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Experimental/ adsorption desorption diffusion heat of solution oxidation oxygen palladium alloys solid solubility/ diffusivity solid solubility gaseous oxygen absorption-desorption experiments oxygen partial pressure universal gas constant heat of solution diffusion coefficient solid palladium incomplete isothermal internal oxidation oxygen solubility Arrhenius equation activation energy preexponential factor temperature 1123 K temperature 1173 K PdJkJk/ A6630 Diffusion and ionic conduction in solids A6475 Solubility, segregation, and mixing A6845D Adsorption and desorption kinetics evaporation and condensation A8260L Thermodynamics of solutions A8160B Surface treatment and degradation of metals and alloys/ temperature 1.123E+03 K temperature 1.173E+03 K/ Pd/ss