Structural, Thermal and Magnetic Properties of Ga Excess Ni-Mn-Ga
The martensitic transition and the ferro- to paramagnetic transition have been studied in a series of Ga excess Ni-Mn-Ga specimens [Ni2-xMnGa1+x (0.4≤ x≤ 0.9)] by differential scanning calorimetry and magnetization measurements. The martensitic transition exhibits a hysteresis whose width is similar to Ni2MnGa, indicating that the transition is thermoelastic. The latent heat of transformation is comparable with other Ni-Mn-Ga alloys. A substantial increase in the martensitic transition temperature is observed due to Ga doping. Interestingly, the x-ray diffraction pattern of all the compositions studied show a modulated martensitic structure in the martensitic phase.
V. A. Chernenko and J. M. Barandiaran
S. Singh et al., "Structural, Thermal and Magnetic Properties of Ga Excess Ni-Mn-Ga", Materials Science Forum, Vol. 635, pp. 43-47, 2010