• DocumentCode
    766493
  • Title

    The Overlap of First- and Second-Order Phase Transitions and Related Magnetic Entropy Changes in Ni _2 + x Mn _1 - x Ga Heusler Alloys

  • Author

    Khan, Mahmud ; Stadler, Shane ; Craig, Jonathan ; Mitchell, Joseph ; Ali, Naushad

  • Author_Institution
    Dept. of Phys., Southern Illinois Univ.
  • Volume
    42
  • Issue
    10
  • fYear
    2006
  • Firstpage
    3108
  • Lastpage
    3110
  • Abstract
    A study of the magnetostructural phase transition and related magnetic entropy changes, DeltaSM, in the vicinity of a first-order magnetostructural transition, in polycrystalline shape memory alloys Ni2+xMn1-x Ga (x=0.16,0.17,0.18,0.19,0.20) have been done. Thermal expansion measurements reveal the gradual overlap of the first- and second-order phase transitions that results in the large magnetic entropy changes in the alloys. We observed a magnetic entropy change of DeltaSM=-66.2 J/kg-1middotK-1 between 350 K and 350.5 K in a field change of 5 T in Ni2+xMn 1-x Ga for x=0.19
  • Keywords
    entropy; magnetic transitions; manganese alloys; nickel alloys; shape memory effects; thermal expansion measurement; 5 T; Heusler alloys; Ni2MnGa; first-order phase transitions; magnetic entropy; magnetostructural phase transition; polycrystalline shape memory alloys; second-order phase transitions; thermal expansion measurements; Entropy; Gallium alloys; Magnetic field measurement; Magnetic materials; Manganese alloys; Nickel alloys; Phase measurement; Shape memory alloys; Superconducting magnets; Temperature; Magnetic materials; magnetoelasticity;
  • fLanguage
    English
  • Journal_Title
    Magnetics, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    0018-9464
  • Type

    jour

  • DOI
    10.1109/TMAG.2006.879632
  • Filename
    1704542
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=766493