Mass-spectroscopic study of the diffusion and solubility of helium in submicrocrystalline palladium |
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Authors: | A N Zhiganov A Ya Kupryazhkin R R Mulyukov I Kh Bitkulov |
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Institution: | (1) Ural State Technical University, ul. Mira 19, Yekaterinburg, 620002, Russia;(2) Institute of Problems of Metal Superplasticity, Russian Academy of Science, ul. Khalturina 39, Ufa, 450001, Bashkortostan, Russia |
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Abstract: | By the method of helium thermal desorption from submicrocrystalline palladium presaturated in the gaseous phase, the diffusion coefficient D eff and solubility coefficient C eff of helium are measured in the range P=0–3 MPa and T=293–508 K. The pressure dependence of C eff flattens at high pressures. At low saturation pressures, the temperature dependences of the diffusion and solubility coefficients may be divided into (1) high-temperature (400–508 K) and (2) low-temperature (293–400 K) ranges described by the exponentials D 1, 2=D 0exp (−E 1, 2 D /kT) and C 1, 2=C 0exp (−E 1, 2 S /kT). The energies of diffusion activation are E 2 D =0.0036±0.0015 eV and E 1 D =0.33±0.03 eV, and the solution energies are E 2 S =−0.025±0.008 eV and E 1 S =0.086±0.008 eV in the low-and high-temperature ranges, respectively. Mechanisms behind the diffusion and solution of helium are discussed. |
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