Negative thermal expansion in CuCl: An extended x-ray absorption fine structure study (Articolo in rivista)

Type
Label
  • Negative thermal expansion in CuCl: An extended x-ray absorption fine structure study (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • M. Vaccari, R. Grisenti, P. Fornasini, F. Rocca, A. Sanson (2007)
    Negative thermal expansion in CuCl: An extended x-ray absorption fine structure study
    in Physical review. B, Condensed matter (Online)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • M. Vaccari, R. Grisenti, P. Fornasini, F. Rocca, A. Sanson (literal)
Pagina inizio
  • 184307 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 75 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Ist. Nazl. Fis. Mat., I-38050 Trento, Italy; Univ. Trento, Dipartimento Fis, I-38050 Trento, Italy; CNR, Ist. Foton. & Nanotecnol., Sez. Trento, I-38050 Povo, Trento, Italy (literal)
Titolo
  • Negative thermal expansion in CuCl: An extended x-ray absorption fine structure study (literal)
Abstract
  • Extended x-ray absorption fine structure (EXAFS) has been measured from liquid helium to ambient temperature at the Cu K edge of copper chloride (CuCl) to investigate the local origin of negative thermal expansion. A quantitative analysis of the first coordination shell, performed by the cumulant method, reveals that the nearest-neighbor Cu-Cl interatomic distance undergoes a strong positive expansion, contrasting with the much weaker negative expansion of the crystallographic distance between average atomic positions below 100 K. The anisotropy of relative thermal vibrations, monitored by the ratio gamma between perpendicular and parallel mean square relative displacements, is considerably high, while the diffraction thermal factors are isotropic. The relative perpendicular vibrations measured by EXAFS are related to the tension mechanism and to the transverse acoustic modes, which are considered responsible for negative thermal expansion in zinc-blende structures. (literal)
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