Pressure-composition isotherms for nanocrystalline palladium hydride

Journal Article · Mon Jul 25 00:00:00 EDT 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.73.557· OSTI ID:7256828

Wolf, R J; Lee, M W ^[1]; Ray, J R ^[2]

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1. Savannah River Technology Center, Westinghouse Savannah River Company, Aiken, South Carolina 29808 (United States)
2. Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634-1911 (United States)

We present results from Monte Carlo simulations of the pressure-composition isotherms of nanometer-size palladium clusters under hydrogen loading. In contrast to simulations of bulk samples, the clusters do not show a phase transformation upon hydriding. A study of the hydrogen loading of the clusters shows that they load the surface first and then the interior, with no evidence of a phase transformation. We relate this behavior of our models to the observed narrowing of the plateau (miscibility gap) in the phase boundary of the pressure-composition phase diagram of nanocrystalline palladium.

• DOE Contract Number: AC09-89SR18035
• OSTI ID: 7256828
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 73:4; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ADSORPTION
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
DIAGRAMS
HYDRIDATION
HYDRIDES
HYDROGEN COMPOUNDS
ISOTHERMS
LOADING
MATERIALS HANDLING
PALLADIUM COMPOUNDS
PALLADIUM HYDRIDES
PHASE DIAGRAMS
PRESSURE DEPENDENCE
SOLID CLUSTERS
SORPTION
TRANSITION ELEMENT COMPOUNDS