 Johnson Matthey, Hatton Garden, London. |
Permeation of Hydrogen through Palladium-Silver Membranes
STRAIN-GRADIENT-INDUCED “UPHILL EFFECTS”
Platinum Metals Review
Article Synopsis
The hydrogen content gradients that occur during hydrogen permeation through palladium-silver membranes produce complementary strain gradients of lattice expansion, which induce opposing Gorsky Effect components of Diffusion Flux. A body of observations of related “uphill effects” and allied diffusion phenomena have recently been studied, using sheet and tube membranes; these phenomena have been correlated with hydrogen pressure-hydrogen content relationships of the Pd77Ag23Hn system.