Tuning the Magnetic Phase Transitions in TbMn 2‐x Ti x Si ₂ ( x = 0–0.3)

Magnetocaloric materials receive considerable attention as promising candidates for next‐generation energy‐efficient and environmentally benign solid‐state refrigeration technologies. These materials exhibit the magnetocaloric effect (MCE), whereby heat is absorbed or released upon the application or removal of a magnetic field. In this study, the magnetocaloric properties of compounds TbMn 2‐x Ti x Si 2 (0.1 ≤ x ≤ 0.3) are systematically investigated. The series exhibits a substantial magnetocaloric response and large refrigerant capacities, rendering them attractive for low‐temperature cooling applications. Comprehensive structural and magnetic characterizations are conducted using temperature‐dependent neutron diffraction, magnetization measurements, and specific heat analysis. The substitution of Ti for Mn leads to a noticeable expansion of the unit cell and induces pronounced modifications in the magnetic transition behavior. Notably, the two first‐order ferromagnetic transition temperatures progressively decrease with increasing Ti content, shifting from T C1 = 50 K and T C2 = 62 K for x = 0.0 to T C1 = 37 K and T C2 = 44 K for x = 0.3. These results underscore of magnetic phase transitions and MCE performance through chemical substitution, reinforcing the potential of Ti‐doped TbMn 2‐x Ti x Si 2 compounds for low‐temperature magnetic refrigeration applications.