Crystal structure of 7M modulated Ni-Mn-Ga martensitic phase (Articolo in rivista)

Type
Label
  • Crystal structure of 7M modulated Ni-Mn-Ga martensitic phase (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.actamat.2008.05.010 (literal)
Alternative label
  • Righi L. a; Albertini F. b; Villa E. c; Paoluzi A. b; Calestani G. a; Chernenko V. c; Besseghini S. c; Ritter C. d; Passaretti F. c (2008)
    Crystal structure of 7M modulated Ni-Mn-Ga martensitic phase
    in Acta materialia; Pergamon-Elsevier Press Science LDT, Oxford (Regno Unito)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Righi L. a; Albertini F. b; Villa E. c; Paoluzi A. b; Calestani G. a; Chernenko V. c; Besseghini S. c; Ritter C. d; Passaretti F. c (literal)
Pagina inizio
  • 4529 (literal)
Pagina fine
  • 4535 (literal)
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  • 56 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • In: Acta Materialia, vol. 56 (16) pp. 4529 - 4535. Pergamon-Elsevier Science, 2008. (literal)
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  • 16 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • a Università di Parma, Dipartimento Chimica Generale e Inorganica Università di Parma, Italy; b CNR-IMEM, Parma, Italy; c CNR-IENI, Lecco, Italy; d Institut Laue Langevin Grenoble, France (literal)
Titolo
  • Crystal structure of 7M modulated Ni-Mn-Ga martensitic phase (literal)
Abstract
  • For the first time, the 7M modulated structure, frequently observed in ferromagnetic shape memory Ni-Mn-Ga martensitic phases, is solved by powder diffraction analysis. Two polycrystalline samples with composition Ni2Mn1.2Ga0.8 and Ni2.15Mn0.85Ga, respectively, showing a 7M martensitic state stable at room temperature, were studied. The determination of the modulated crystal structure of Ni2Mn1.2Ga0.8 martensite was achieved by refining the X-ray powder diffraction pattern by the Rietveld method. The basic structure belongs to monoclinic symmetry. The crystal structure, solved within the superspace approach, is found to show an incommensurate 7M modulation with q = 0.308c*. The Rietveld refinement for Ni2.15Mn0.85Ga martensite on the basis of neutron powder data surprisingly provides a very similar incommensurate 7M structure with the same periodicity and analogous modulation function. The incommensurate structure presents typical displacive modulation with several analogies with the Zhdanov (5,(2) over bar)(2) stacking sequence. (literal)
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