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- W2000617268 abstract "H diffusion constants have been determined from steady-state fluxes through Pd−Ag alloy membranes. The upstream side is maintained at a nearly constant pup (and consequently at a nearly constant rup = H/(Pd(1-x)Agx)) atom ratio, whereas the downstream side is at pH2 ≈ 0 (rdown = 0) (423−523 K). It is shown that the permeability is a maximum for atom fraction Ag, XAg = 0.23 (423−523 K) at both pup = 20.3 and 50.6 kPa. DH has been determined for some Pd−Ag alloys as a function of r in the dilute region, and it decreases with r even at small H contents for alloys with XAg < 0.35. The concentration dependence of DH(cH) has been determined for the Pd0.77Ag0.23 alloy over a large concentration range. The effect of nonideality on DH(r) and ED(r) has been systematically determined as a function of XAg, where XAg is the atom fraction of Ag in the H-free alloy. (dDH/dr) increases with XAg up to XAg = 0.35 and then changes from negative to positive at ≈0.35. The activation energies for diffusion, ED(r), have been determined as a function of H content in the dilute range for several Pd−Ag alloy membranes, and the conversion to concentration-independentvalues has been carried out in several different ways." @default.
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- W2000617268 date "2008-01-01" @default.
- W2000617268 modified "2023-09-27" @default.
- W2000617268 title "Diffusion of H through Pd−Ag Alloys (423−523 K)" @default.
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- W2000617268 doi "https://doi.org/10.1021/jp076690b" @default.
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