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Magnetocaloric materials have received significant attention of researchcommunity as they can minimize the use of harmful gases (CFCs, HFCs) and rendereco-friendly refrigeration. Heusler alloys (Ni2MnGa) are known for theirmagnetocaloric effects, which make them useful as energy efficient andeco-friendly refrigerating materials. Magnetocaloric properties significantlydepend on the composition of these alloys. Ni-Mn-Ga is one of the interestingHeusler systems, which exhibits magnetocaloric properties. In the presentstudy, we performed the thermodynamic optimization of two sub binaries of theNi-Mn-Ga system: Mn-Ga and Ni-Ga, using CALPHAD approach. A ModifiedQuasichemical Model (MQM) was used to describe the thermodynamic properties ofthe liquid solutions in both the binaries. Both the binaries were combined withMn-Ni to develop a self-consistent thermodynamic database for Ni-Mn-Ga. Inorder to resolve the existing experimental discrepancies in the Mn-Ga and Ni-Gasystem, few alloy compositions were prepared and analyzed using differentialthermal analysis. Finally, the developed thermodynamic database was used tocalculate the ternary isothermal section of the Ni-Mn-Ga (Heusler alloy) systemat 1073 K with a proposed phase region for magnetocaloric applications.

Development of a self-consistent thermodynamically optimized database  along with phase transition experiments in Ni-Mn-Ga system for magnetocaloric  applications