Reaction diffusion in the silverhafnium system

Reaction diffusion between pure Ag and Hf in the temperature range from 1070 to 1180 K has been studied. Two intermetallic compounds, AgHf and AgHf 2, have been observed in the diffusion zone. The layer growth of the AgHf phase obeys a parabolic law without incubation time, while the AgHf 2 phase ap...

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Bibliographic Details
Published in:Journal of alloys and compounds 1995-08, Vol.226 (1), p.185-189
Main Authors: Taguchi, Osamu, Iijima, Yoshiaki
Format: Article
Language:English
Subjects:
Applied sciences
Chemical interdiffusion
diffusion barriers
Condensed matter: structure, mechanical and thermal properties
Diffusion in solids
Exact sciences and technology
Metals. Metallurgy
Physics
Reaction diffusion
Silver-hafnium systems
Transport properties of condensed matter (nonelectronic)
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Summary:Reaction diffusion between pure Ag and Hf in the temperature range from 1070 to 1180 K has been studied. Two intermetallic compounds, AgHf and AgHf 2, have been observed in the diffusion zone. The layer growth of the AgHf phase obeys a parabolic law without incubation time, while the AgHf 2 phase appears after a long incubation time (432 ks) at 1180 K and cannot be observed below 1150 K. The temperature dependence of the interdiffusion coefficient and the square of the layer growth rate constant of the AgHf phase shows linear Arrhenius relationships. The activation energy for interdiffusion in the AgHf phase is nearly equal to that for the layer growth of it.
ISSN:0925-8388
1873-4669
DOI:10.1016/0925-8388(95)01566-3