Physical Geography and Sciences



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Prayushi Bhorania, Computer Information Systems, Jackson Kubik, Physics and Mahmud Khan, Computer Information Systems
Faculty Mentor: Professor Arjun Pathak, Physics

The coupling between structural and magnetic transitions is a paramount key for designing the materials that exhibit multifunctionality. During such coupling, a substantial change in magnetization occurs in the vicinity of phase transition leading to a sizeable caloric effect, a useful property for cooling, refrigeration, air conditioning, and heat-pumping applications. One of the significant challenges of the research related to magnetic refrigeration is the designing of potential materials consisting of earth-abundant as well as non-toxic elements, which gives a large caloric effect at the lower applied magnetic field. Recently, the magnetic and thermodynamics properties of several MnTX (T = transition metal X = p block elements) reported, which showed a martensitic structural transition from a low-temperature TiNiSi-type orthorhombic phase to high-temperature Ni2In-type hexagonal phase and exhibited a significant caloric effect (Samanta et al., APL 101, 242405, 2012). However, most of the earlier studies reported the compound exhibit significantly large thermal and magnetic hysteresis, an unwanted characteristic for application, or they contain expensive elements such as Ge, In, or Ga. Here we present phase transition and magnetic properties of Mn1-xFexNiSi1-yXy alloys, which are abundant, non-toxic, and the synthesis method is relatively easy and cost-effective.

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Phase Transition, and Magnetic Properties of Mn-Based Intermetallic Compounds
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