The structural and magnetic properties of Ni2Mn1−xBxGa Heusler alloys

Effect of selective substitution of Co for Ni or Mn on the superstructure and microstructural properties of Ni50Mn29Ga21

“…These alloys were prepared by induction melting of appropriate quantities of the constituent elements Ni, Ga and Co of 99.999% purity and Mn of 99.99% purity under argon atmosphere. Loss of Mn up to 2 wt.% by evaporation during melting has been reported [9] in the literature. In our experiments, we had assessed the loss of Mn to be 1.2 wt.% by comparing the starting compositions with the final compositions determined by Energy Dispersive X-ray Analyses (EDAX).…”

“…Alloying with another element influences both the crystal and electronic structures of the parent compound and affects the stability of austenitic and martensitic states; it can thus influence the physical properties drastically [6][7][8][9][10]. Magnetic field induced transformations from martensitic to austenitic states have been reported in Ni 50−x Mn 30 Ga 20 Co x (x = 5, 7, 9 and 13) [11].…”

Effect of isoelectronic substitution on phase transition and magnetic properties of Ni57Mn18Ga25−xInx (0 ≤ x ≤ 8) alloys with Ni excess

“…In previous reports, Fe, Co, Cu, Ti, B, and rare earth elements have been doped into Ni-Mn-Ga alloys. [7][8][9][10][11][12][13][14][15][16][17][18] In case of the substitution of Fe, Co, or Cu for Ni, the martensitic transformation temperatures are significantly decreased. The Curie temperature and the saturation magnetization are increased by Fe and Co, 7-12 and decreased by Cu.…”

“…15,16 By doping Ti, B, and rare earth elements, the martensitic transformation temperatures are generally increased, but the Curie temperature and the saturation magnetization are obviously decreased. [17][18][19] It is well known that the magnetic properties of Ni-Mn-Ga alloys are of crucial importance for the realization of the magnetic functionalities. Thus, is it possible to simply manipulate the martensitic transition temperatures, simultaneously retaining the magnetic properties of Ni-Mn-Ga alloys?…”

Influence of boron addition on the microstructure, structural and magnetic properties of Ni53.5Mn26.0Ga20.5 alloy

“…Recently the effect of boron substituted for Mn and Ga on the structural and magnetic transformation temperatures has been reported from a study of Ni 2 Mn 1Àx B x Ga [19] and Ni 2 MnGa 1Àx B x [20] series. In the former system, both T M and the Curie temperature (T C ) are found to decrease by nearly 28% with B substitution by x ¼ 0.12, and for x > 0.12 no martensitic phase is observed.…”