| Autor: |
Di Pascasio, F., Gozzi, D., Panella, B., Trionfetti, C. |
| Předmět: |
|
| Zdroj: |
Journal of Applied Physics; 2/15/2005, Vol. 97 Issue 4, p043304, 11p, 2 Diagrams, 1 Chart, 12 Graphs |
| Abstrakt: |
The absorption of hydrogen by Pd wire samples has been studied at 299 K and in the H2 pressure range from 18 to 1800 mbar under both tensile stress and tensile stress under cold H2 plasma. Plasma is generated in a corona discharge regime by applying a dc high voltage between a Pd wire and a cylindrical counterelectrode. Positive and negative coronas have been performed. Three independent experimental quantities have been simultaneously measured: ratio x=nH/nPd, with n the number of atoms; ratio R/R0, with R the four-probe resistance of the wire and R0 the resistance when x=0; and ratio Δl/l0, with Δl the length change of the wire and l0 its length when x=0. From the thermodynamic analysis of data, the absorption standard chemical potential, Δμabs0, and the excess chemical potential, Δμexc, of hydrogen atoms in Pd have been obtained. At constant T, H2 pressure, and tensile stress, the x value under cold plasma is always higher. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
