Article ID Journal Published Year Pages File Type
1627455 Journal of Alloys and Compounds 2006 8 Pages PDF
Abstract

Annealed Pd exhibits supersaturation of the dilute phase before the hydride phase forms and this is characterized here by measurements of both |ΔHH| and equilibrium pH2pH2. Dilute phase |ΔHH| and pH2pH2 values were determined for annealed Pd for both absorption and desorption of H2 and the |ΔHH| were the same for both and the dilute phase H2 isotherms were also the same, i.e., absorption/desorption was reversible. Pd, which has a high dislocation density, however, does not exhibit supersaturation, and its |ΔHH| values are a continuous function of H/Pd in contrast to annealed Pd where there is a discontinuity at the phase boundary. In addition, absorption/desorption of H2 is irreversible for this “cycled” Pd. The same phenomena were examined for several substitutional fcc Pd–Mn alloys; supersaturation was also observed for the three alloys: XMn = 0.01, 0.05 and 0.075.

Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
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