Tracking the local structure at interfaces between hydride-forming metals: A case study of Mg-Pd nanoparticles by X-ray spectroscopy (Articolo in rivista)

Type
Label
  • Tracking the local structure at interfaces between hydride-forming metals: A case study of Mg-Pd nanoparticles by X-ray spectroscopy (Articolo in rivista) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Alternative label
  • L. Pasquini, F. Boscherini, E. Callini, C. Maurizio, L. Pasquali, M. Montecchi, E. Bonetti (2011)
    Tracking the local structure at interfaces between hydride-forming metals: A case study of Mg-Pd nanoparticles by X-ray spectroscopy
    in Physical review. B, Condensed matter and materials physics (CD-ROM)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • L. Pasquini, F. Boscherini, E. Callini, C. Maurizio, L. Pasquali, M. Montecchi, E. Bonetti (literal)
Pagina inizio
  • 184111-1 (literal)
Pagina fine
  • 184111-12 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 83 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 12 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Department of Physics and CNISM, University of Bologna, v. Berti-Pichat 6/2, I-40127 Bologna, Italy Consiglio Nazionale delle Ricerche, IOM-OGG, c/o ESRF GILDA CRG, BP 220, F-38043 Grenoble, France Department of Physics, University of Padova, via Marzolo 8, I-35131 Padova, Italy Department of Materials and Environmental Engineering, University of Modena and Reggio Emilia, v. Vignolese 905, I-41125 Modena, Italy CNR-IOM, Area Science Park, s.s.14, km 163.5, I-34012 Basovizza (Trieste), Italy (literal)
Titolo
  • Tracking the local structure at interfaces between hydride-forming metals: A case study of Mg-Pd nanoparticles by X-ray spectroscopy (literal)
Abstract
  • The structure at the interface between elements or phases that exhibit different hydrogen (H) binding energies exerts a profound influence on the thermodynamics of H in nanophase materials. In this paper, we study the local structure at the Mg/Pd interface in Mg nanoparticles with partial Pd coating, and we map its evolution in response to annealing and H sorption. This task is accomplished by x-ray photoelectron spectroscopy and x-ray absorption spectroscopy, also including in situ experiments, with the support of crystallographic information from x-ray diffraction. It is shown that the initial Pd surface layer reacts with Mg at relatively low temperatures, leading to irreversible formation of a Mg-rich intermetallic phase Mg6Pd. Due to the high Mg-H binding energy, this phase reversibly transforms, upon H absorption, into a nanophase mixture of magnesium hydride and a Pd-rich intermetallic with H in solid solution, MgPdH? . These reversible structural changes are discussed with reference to recent calculations that highlight their relevance to the thermodynamics of the metal-hydride transition. The picture drawn here might be relevant to other multiphase materials presently investigated in the field of hydrogen-related science and technology. (literal)
Prodotto di
Autore CNR

Incoming links:


Autore CNR di
Prodotto
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi
data.CNR.it