ABSTRACT
The sustainable development goals of the United Nations and the Paris Convention, 2015, led to the sudden research surge in environment-friendly and sustainable, material and technology. One such technology is magnetic refrigeration, which is very crucial for reducing the greenhouse effect and global warming. The sustainable technology demands sustainable material. The Gd-based magnetic refrigeration material has minimal industrial acceptance due to very high criticality index and cost. The Ni-Mn-based Heusler alloys, for magnetic refrigeration, are considered as promising material due to low criticality index, toxicity, and cost. The present chapter discusses the Co-doped Ni2Mn1+xIn1-x Heusler alloys as sustainable material for environment-friendly magnetic refrigeration technique. The sustainability of Heusler alloy and its application for environment-friendly magnetic refrigerator is discussed in terms of criticality index of the material and magnetocaloric property using shift of martensitic transition to low temperature with the applied magnetic field and reversible martensitic transition. The Heusler alloy preparation technique is a very common technique that is used by the industry. Heusler alloys have high recyclability because constituent elements are almost 100% recyclable. However, there are certain challenges that need to be overcome and are discussed in this chapter with possible solution.
