A neutron diffraction study of the R15Ge9C compounds (R = Ce, Pr, Nd) (Articolo in rivista)

Type
Label
  • A neutron diffraction study of the R15Ge9C compounds (R = Ce, Pr, Nd) (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.jallcom.2014.01.115 (literal)
Alternative label
  • Tence, S.; Isnard, O.; Wrubl, F.; Manfrinetti, P. (2014)
    A neutron diffraction study of the R15Ge9C compounds (R = Ce, Pr, Nd)
    in Journal of alloys and compounds
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Tence, S.; Isnard, O.; Wrubl, F.; Manfrinetti, P. (literal)
Pagina inizio
  • 148 (literal)
Pagina fine
  • 152 (literal)
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  • 594 (literal)
Rivista
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  • 5 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • Joseph Fourier University; Centre National de la Recherche Scientifique (CNRS); Universite de Bordeaux - PRES; University of Genoa; Inst SPIN CNR (literal)
Titolo
  • A neutron diffraction study of the R15Ge9C compounds (R = Ce, Pr, Nd) (literal)
Abstract
  • In this work we report the results of the neutron diffraction investigation performed on the germanides R15Ge9C, for R = Ce, Pr and Nd (La15Ge9Fe-type, hP(50), P(63)mc, Z = 2), to refine the crystal superstructure of these compounds and determine their magnetic structures. The interstitial carbon atoms occupy mainly the 2b Wyckoff site in the position (1/32/3 similar to 1/2) and also, with a smaller occupancy rate, the Wyckoff site 2a at (00 similar to 1/2). In the magnetic state, the three compounds display predominantly a ferromagnetic behavior with the propagation vector k = [000]. These results are in agreement with the magnetization measurements, with T-C = 10, 30 and 80 K as Curie temperature of Ce15Ge9C, Pr15Ge9C and Nd15Ge9C, respectively. Ce15Ge9C and Nd15Ge9C present a ferromagnetic alignment of the R moments along the caxis and an antiferromagnetic spin arrangement within the (a-b) plane. For Pr15Ge9C the ferromagnetic contribution is found within the (a-b) plane, as previously observed for the isotypic compound Tb15Si9C. The carbides crystal structure possesses four inequivalent rare earth sites carrying different magnetic moments, leading to mean values of 0.9 lB/Ce, 1.1 lB/Pr and 2.2 lB/Nd for Ce15Ge9C, Pr15Ge9C and Nd15Ge9C, respectively. The magnetic structures of these R15Ge9C compounds differ strongly from those of their parent R5Ge3 germanides, but present strong similarities with the structures of the R15Si9C compounds. The overall results indicate and confirm the drastic influence of carbon insertion in the rare earth environment. (C) 2014 Elsevier B.V. All rights reserved. (literal)
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