Temperature Dependence of Magnetic Properties in Ni-Mn-Ga shape Memory Alloys

M.D. Lee, Ngo Van Nong, N.P. Thuy, Y.D. Yao, Y. Liou, Y.Y. Chen, C.R. Wang

Research output: Contribution to journalJournal articleResearchpeer-review


Due to exhibiting giant field-induce strain, the Ni2MnGa shape memory alloys are great interest for both scientific researches and industry applications. The non-stoichiometric Ni50Mn25+xGa25–x alloys with x varied from 1.5, 2.5 to 4 have been fabricated by arc-melting. Martensitic transformation temperature for structure transformation from tetragonal to cubic (TM) was observed from the magnetization, electrical resistivity and X-ray diffraction studies as functions of temperature below 400 K. We found that TM increases roughly from 280 K to 310K with increasing x from 1.5 to 4. However, the Curie transition (TC) is roughly at 380 K for all the samples, it is insensitive to the variation of Mn/Ga ratio. The electrical resistivity data exhibit a deep near TM and a slope change near TC. We have experimentally demonstrated that the shape memory effect can be occurred at room temperature with a proper concentration variation of Mn and Ga.
Original languageEnglish
JournalPhysica Status Solidi. C: Current Topics in Solid State Physics
Issue number12
Pages (from-to)3579
Publication statusPublished - 2004
Externally publishedYes


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