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

Abstract

Effect of isoelectronic substitution of In for Ga on the phase transition and magnetic properties was studied in Ni 57 Mn 18 Ga 25Àx In x (0 x 8) alloys. With the increasing In content, the roomtemperature phase structure evolved from tetragonal martensite to cubic austenite. The martensitic transformation temperatures were significantly decreased by the substitution of In for Ga, but the austenitic Curie temperature was only slightly decreased. Especially, both thermal and isothermal magnetization measurements revealed that the Curie temperature and saturation magnetization of the martensite were independent on the isoelectronic substitution. The results were discussed by considering the phase structures and the atomic interactions. V C 2015 AIP Publishing LLC.

Magnetic Properties and Phase Diagram of Ni50Mn $$_{50-x}$$ 50 - x Ga $$_{x/2}$$ x / 2 In $$_{x/2}$$ x / 2 Magnetic Shape Memory Alloys

“…Therefore, it is of fundamental interest to investigate a system of Ni-Mn-(Ga,In) to examine the Ga?In composition dependence of T M s when it intersects with the magnetic transition temperatures. While several researches have been done focusing on different sections, such as Ni 50 Mn 25 Ga 25Àx In x by Khan et al [11], Ni 50 Mn 33 Ga 17Àx In x by Pramanick et al [12], Ni 50 Mn 34:5 Ga 15:5Àx In x by Takeuchi et al [13] and Ni 57 Mn 18 Ga 25Àx In x by Zhang et al [14,15], no systematic investigations have been performed based on the Ga:In = 1:1 equiatomic sections.…”