Article

Contrasting Effects of Bi and Si Substitution at the Ni Site on Magnetostructural Transitions and Magnetocaloric Properties in Ni–Mn–In Heusler Alloys

Abhiyan OliSchool of Physics and Applied Physics, Southern Illinois University, Carbondale, IL 62901, USAIgor DubenkoSchool of Physics and Applied Physics, Southern Illinois University, Carbondale, IL 62901, USAA. B. GranovskyDepartment of Physics, Samarkand State University after Sharof Rashidov, Samarkand 140104, UzbekistanDushmantha K. GusthigngnhadurageSchool of Physics and Applied Physics, Southern Illinois University, Carbondale, IL 62901, USAMuhammad A. IqbalSchool of Physics and Applied Physics, Southern Illinois University, Carbondale, IL 62901, USAMargaret HillDepartment of Chemistry & Physics, Southeast Missouri State University, Cape Girardeau, MO 63701, USAShane StadlerDepartment of Physics & Astronomy, Louisiana State University, Baton Rouge, LA 70803, USANaushad AliSchool of Physics and Applied Physics, Southern Illinois University, Carbondale, IL 62901, USASaikat TalapatraSchool of Physics and Applied Physics, Southern Illinois University, Carbondale, IL 62901, USA

Magnetismjournal2026en

ABI

Abstract

We investigated the structural, magnetic, magnetocaloric, and magnetotransport properties of Ni50Mn35In15 Heusler alloys via partial substitution of Ni with 3 at.% Bi (Ni47Bi3Mn35In15) and 3 at.% Si (Ni47Si3Mn35In15) synthesized by arc melting. X-ray diffraction confirms a predominantly L21 cubic structure (space group Fm-3m), while SEM/EDX analysis verifies compositional homogeneity. Temperature-dependent magnetization measurements reveal that the Bi-substituted alloy exhibits a first-order magnetostructural transition associated with the martensitic transformation, followed by a second-order magnetic phase transition from ferromagnetic to paramagnetic behavior near the Curie temperature. In contrast, the Si-substituted alloy shows a single second-order transition with negligible thermal hysteresis, indicating suppression of the martensitic phase. The Curie temperature decreases from 324 K for the parent alloy to 313 K and 286 K for the Bi- and Si-substituted alloys, respectively. A maximum magnetic entropy change of 6.0 Jkg−1K−1 and 4.5 Jkg−1K−1 is observed for the Bi- and Si-substituted alloys, respectively, under an applied magnetic field change of 50 kOe, with corresponding relative cooling power values of 303 Jkg−1 and 345 Jkg−1. These results demonstrate that lattice expansion (Bi) and contraction (Si) distinctly modify Mn–Mn exchange interactions, enabling tunable magnetocaloric performance in Ni–Mn–In Heusler alloys.

Topics

Shape Memory Alloy Transformations Magnetic and transport properties of perovskites and related materials Thermal Expansion and Ionic Conductivity

Identifiers

DOI: 10.3390/magnetism6020020

Citations and references

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