Pd/H system in H{sub 2} plasmas

Journal Article · Tue Feb 15 04:00:00 EST 2005 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.1844607· OSTI ID:20668190

Di Pascasio, F; Gozzi, D; Panella, B; Trionfetti, C ^[1]

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1. Dipartimento di Chimica, Universita di Roma 'La Sapienza', Piazzale Aldo Moro 5, 00185 Rome (Italy)

The absorption of hydrogen by Pd wire samples has been studied at 299 K and in the H{sub 2} pressure range from 18 to 1800 mbar under both tensile stress and tensile stress under cold H{sub 2} 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=n{sub H}/n{sub Pd}, with n the number of atoms; ratio R/R{sub 0}, with R the four-probe resistance of the wire and R{sub 0} the resistance when x=0; and ratio {delta}l/l{sub 0}, with {delta}l the length change of the wire and l{sub 0} its length when x=0. From the thermodynamic analysis of data, the absorption standard chemical potential, {delta}{mu}{sub abs}{sup 0}, and the excess chemical potential, {delta}{mu}{sup exc}, of hydrogen atoms in Pd have been obtained. At constant T, H{sub 2} pressure, and tensile stress, the x value under cold plasma is always higher.

• OSTI ID: 20668190
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 4 Vol. 97; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION
ATOMS
COLD PLASMA
CORONA DISCHARGES
CYLINDRICAL CONFIGURATION
HYDROGEN
PALLADIUM
POTENTIALS
PRESSURE RANGE KILO PA
STRESSES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
TENSILE PROPERTIES
THERMODYNAMICS
WIRES