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Structural Phase Stability in Ni2.17Mn0.83Ga Film
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Shoji Ishida1), Yoshinori Tanaka2) and Setsuro Asano3)
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1) Department of Physics, Faculty of Science, of Kagoshima University
2) The Graduate School of Science and Engineering, Kagoshima University
3) The Graduate School of Arts and Sciences, The University of Tokyo
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Ni2.17Mn0.83Ga transforms between a cubic structure and a coexistent state of an orthorhombic and a monoclinic structure. The electronic structures of Ni2.17Mn0.83Ga and Ni2MnGa were calculated for thin films to investigate the influence of excess nickel and the effect of the surface on the phase stability. The total energy and band energy were also calculated to examine the role of the each constituent atoms in the structural stability. It is theoretically predicted that the Ni2.17Mn0.83Ga film preserve the shape memory property like the bulk states and that the excess nickel atoms contribute largely to the stability of the monoclinic structure.
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Keyword: shape memory, Ni2MnGa, electronic structure, band energy, monoclinic structure
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Received: November 20, 2001
Accepted: April 15, 2002 ,
Published online: September 06, 2005 |
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Copyright (c) 2005 The Japan Institute of Metals |
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