physica status solidi (a) · 1974 · 58 citations · 31 references
EngineeringMaterials EngineeringMaterials ScienceHeat TransferThermodynamicsTransport PhenomenaChemical ThermodynamicsDiffusion In SolidsHeat ConductionHeat Transfer In SolidsThermal Properties Of MaterialsTransport PropertiesActivation EnergyArrhenius EquationDiffusion Activation EnergyDiffusion BehaviorDiffusion CoefficientsDiffusion KineticsGorsky EffectTemperature Dependence Of Diffusion
The diffusion coefficient and the heat of transport of H and D in Nb were determined by resistance measurements for concentrations between 0.01 and 0.15 at%. An activation energy of (0.123 ± 0.006) eV was measured for D in the whole temperature range investigated (150 to 320 K). For H a pronounced break in the Arrhenius plot was found at about 225 K in agreement with Gorsky effect measurements [1]. The activation energy changes from (0.093 ± 0.009) eV for T > 225 K to (0.061 ± 0.006) eV for T < 225 K. The ratio of the diffusion coefficients for H and D increases from two at room temperature to about 15 at 150 K. For temperatures between 200 and 320 K the heat of transport ranges between 0.09 and 0.15 eV for H and between 0.10 and 0.17 eV for D.
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