The evolutions of phase transformation, magnetic and electrical transport properties with the change of Fe concentration have been systematically investigated in a series of Ni_60-xFe_13+xGa₂₇ (x = 0–10) Heusler alloys. The structure and heat flow measurements reveal every sample undergoes a disordered-ordered transition from a disordered B2 structure to a L2₁ ordered structure, and a first-order structural transformation from the L2₁ cubic structure to a L1₀ tetragonal structure is corresponding to the martensitic transformation (MT). With increasing Fe concentration, the disordered-ordered transition and ferromagnetic transition shift to higher temperature, while the MT shifts to lower temperature. According to phase diagram established in the present investigation, it is also found that the increase of Fe content can convert the first-order MT from a paramagnetic type to a ferromagnetic one, which is accompanying by an obvious increase of both effective and spontaneous magnetic moments. Furthermore, the calculated magnetocrystalline anisotropy constant (K₁) of the studied alloys monotonically increases as Fe increases. It is evident that the magnetic degrees of freedom in these two MTs remain almost unchanged so that the electron-spin scattering doesn't change, which results in the resistivity difference between the austenitic and martensitic states is feeble. Such an intrinsic nature leads to a weak magnetoresistance (MR) and baroresistance (BR) effects in the studied samples because of only contribution of electron-lattice scattering change on the resistivity. This demonstrates from a negative perspective that the electron-spin scattering change originated from the variation in the magnetic degrees of freedom acts as a dominant role in improvement of the MR and BR effects for the Heusler system possessed the first-order MT.

在一系列 Ni _{60- x} Fe _{13+ x} Ga ₂₇ ( x  = 0–10) Heusler 合金中系统地研究了相变、磁和电传输特性随 Fe 浓度变化的演变。结构和热流测量显示每个样品都经历了从无序B 2 结构到L 2 _{1有序结构的无序有序转变，以及从}L 2 ₁立方结构到L 1 ₀的一阶结构转变四方结构对应于马氏体转变（MT）。随着Fe浓度的增加，无序-有序转变和铁磁转变向较高温度移动，而MT向较低温度移动。根据本研究建立的相图，还发现Fe含量的增加可以将一阶MT从顺磁型转变为铁磁型，伴随着有效磁矩和自发磁矩的明显增加. 此外，计算出的磁晶各向异性常数（K ₁) 所研究的合金随着 Fe 的增加而单调增加。很明显，这两个 MT 中的磁自由度几乎保持不变，因此电子自旋散射没有改变，这导致奥氏体和马氏体状态之间的电阻率差异微弱。这种固有性质导致所研究样品中的磁阻 (MR) 和压力电阻 (BR) 效应较弱，因为只有电子晶格散射变化对电阻率有贡献。这从负面的角度证明了源于磁自由度变化的电子自旋散射变化在具有一阶 MT 的 Heusler 系统的 MR 和 BR 效应改善中起着主导作用。