Incommensurate structures of intermediate phase and martensite phase in Ni2MnGa

Abstract

Neutron diffraction measurements using single crystal and powder synchrotron X-ray diffraction measurements revealed that an intermediate (I-) phase and a martensite (M-) phase in Ni2MnGa have incommensurate modulated structures. The modulation vectors of the I- and M-phases are nearly equal to q 0.341 <220> at 210 K and q 0.427 <220> at 100 K, respectively. Moreover, displacements of Ni, Mn and Ga atoms in both the I- and M-phase are expressed by sinusoidal waves with the same phase and almost the same amplitudes. © 2009 IOP Publishing Ltd.