Diffusion of Deuterium and Isotope Effect in Nickel

概要

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The recovery process of deuterium dissolved in excess in nickel was studied bymeans of the liquid hydrogen quenching and electrical resistivity measurementdeveloped by the author. The diffusion coefficient of deuterium was determinedas 7)=3,l8x10 'exp( -9220/7?7')cm'/sec between 220K and 340K, andcompared with that of hydrogen in the temperatures where the isotope effectwas expected to appear remarkably.The obtained results on the pre-exponential factors, D.'s, and the activationenergies, E's, showed the relations, D..<D.. and E.<E., respectively, whichlooked abnormal from the view point of the classical diffusion theory. The ratio,D./D., was always larger than 1.0 and increased with decreasing temperature,differing from the simple extrapolations of the results by other investigators,in which the ratio decreased below 1.0 with lowering temperature. The aboveisotope effects in hydrogen diffusion cannot be explained by the existing theoriesof diffusion regardless of harmonic or anharmonic treatment.
社団法人日本物理学会の論文
1979-07-15