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Mass Transport in Metallic Solids
Author(s) -
Wever H.
Publication year - 1963
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.196302881
Subject(s) - potential gradient , superposition principle , mass transport , concentration gradient , temperature gradient , isothermal process , lattice (music) , transport phenomena , chemical physics , electrolyte , diffusion , thermal conduction , mechanics , metal , chemistry , thermodynamics , physics , electrode , engineering physics , quantum mechanics , acoustics , environmental chemistry , organic chemistry
Mass transport in a metallic solid requires that the lattice units exchange places. This is made possible by lattice defects. Also, a circular interchange has to be discussed. Driving forces cause the superposition of directional motion over the random motion of site exchange: When a chemical potential gradient exists, isothermal diffusion occurs; with an electrical potential gradient, electrolytic transport takes place; and with a temperature gradient, the effect is thermal diffusion. Both concentrational changes and dimensional changes may accompany these processes. From observation of these phenomena, the mechanism by which lattice particles change places can be deduced. In addition, it is possible to calculate characteristic data, such as migration energy, imaginary change, and heat of transportation.