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Crystal structure and phase transformation in Ni53Mn 25Ga22 shape memory alloy from 20 K to 473 K
Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Materials.
Key Laboratory of Electromagnetic Processin gof Materials Notheastern University, Shenyang.
The Studsvik Neutron Research Laboratory Uppsala University.
Dept of Mateials Science Engineering Northeastern University, Sheyang.
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2005 (English)In: Applied Physics Letters, ISSN 0003-6951, Vol. 87, no 11Article in journal (Refereed) Published
Abstract [en]

The crystal structures, magnetic structures, and phase transformation of the off-stoichiometric Ni53 Mn25 Ga22 were studied by neutron powder diffraction at different temperatures. It is shown that Ni53 Mn25 Ga22 has a tetragonal I4/mmm structure from 20 K to 403 K. An abrupt jump in unit-cell volume around room temperature, corresponding to an endothermic peak in the differential scanning calorimetry curve, was observed. This indicates a pretransformation in the martensitic phase of Ni53 Mn25 Ga22, which is completely different from the phase transformation in the stoichiometric Ni2 MnGa. The sequence of structural transformation in Ni53 Mn25 Ga22 is closely related to its intrinsic temperature-dependent magnetic structure. © 2005 American Institute of Physics.

Place, publisher, year, edition, pages
2005. Vol. 87, no 11
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-29179DOI: 10.1063/1.2043250Local ID: 14451OAI: diva2:249991
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2011-01-12

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