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Crystal structure of martensite and intermediate phases in Ni2MnGa studied by neutron diffraction

  • H. Kushida
  • K. Fukuda
  • T. Terai
  • T. FukudaEmail author
  • T. Kakeshita
  • T. Ohba
  • T. Osakabe
  • K. Kakurai
  • K. Kato
Article

Abstract.

We have investigated crystal structures of martensite and intermediate phases in stoichiometric Ni2MnGa. The neutron diffraction profile of the martensite phase measured at T = 4.2 K exhibits four satellites between [2 0 0]P* and [0 2 0]P* reflections (P stands for the parent phase) at incommensurate positions of [h 2-h 0]P* with h = 0.428, 0.863, 1.136 and 1.572. The profile of the intermediate phase measured at T = 210K exhibits two satellites between [2 0 0]P* and [0 2 0]P* reflections at incommensurate positions of [h 2-h 0]P* with h = 0.343 and 1.657. Although each satellite of the martensite phase moves toward its nearest fundamental reflection as temperature increases, that of the intermediate phase does not move significantly. On the contrary, the intensity of each satellite decreases significantly in the intermediate phase as temperature increases while not in the martensite phase. A synchrotron X-ray diffraction and a Rietveld analysis of the result reveal that, for both the phases, the displacement of atoms from the parent phase are represented by a sine wave whose propagation vector is parallel to [1 1 0]P.

Keywords

Martensite Shape Memory Alloy European Physical Journal Special Topic Martensite Phase Rietveld Analysis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2008

Authors and Affiliations

  • H. Kushida
    • 1
  • K. Fukuda
    • 1
  • T. Terai
    • 1
  • T. Fukuda
    • 1
    Email author
  • T. Kakeshita
    • 1
  • T. Ohba
    • 2
  • T. Osakabe
    • 3
  • K. Kakurai
    • 3
  • K. Kato
    • 4
  1. 1.Department of Materials Science and Engineering, Graduate school of EngineeringOsaka UniversityOsakaJapan
  2. 2.Department of Material ScienceShimane UniversityShimaneJapan
  3. 3.Quantum Beam Science Directorate, Japan Atomic Energy Agency (JAEA), Naka-gunIbarakiJapan
  4. 4.Japan Synchrotron Radiation Research Institute (Spring8)HyogoJapan

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