Structural Relation between the X-Phase and other Phases in Ni2MnGa

Abstract:

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We have investigated stress and temperature dependences of the structure of the X-phase in Ni2MnGa to understand structural relation between the X-phase and other phases. Position and intensity of satellites of the X-phase are different from those of the intermediate (I-) phase under compressive stress, but they approach those of the I-phase with decreasing stress. That is, the structure change associated with the I → X transformation is discontinuous under a compressive stress, while it is continuous under zero stress. In addition, the transformation from the X-phase to the L21-type parent phase is continuous regardless of applied stress. These results strongly suggest the existence of multi-critical point in Ni2MnGa. On the other hand, the transformation from the X-phase to the martensite phase is discontinuous regardless of applied stress.

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Periodical:

Edited by:

V. A. Chernenko and J. M. Barandiaran

Pages:

49-54

DOI:

10.4028/www.scientific.net/MSF.635.49

Citation:

T. Kakeshita et al., "Structural Relation between the X-Phase and other Phases in Ni2MnGa", Materials Science Forum, Vol. 635, pp. 49-54, 2010

Online since:

December 2009

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