Magnetic/structural diagram, chemical composition-dependent magnetocaloric effect in self-doped antipervoskite compounds Sn1−xCMn3+x (0≤x≤0.40)

Abstract The effects of Mn substitutions on the crystal structure, magnetic properties, and magnetocaloric effect (MCE) of antiperovskite Sn 1− x CMn 3+ x (0≤ x ≤0.40) have been investigated detailedly. Both the Curie temperature ( T C ) and the magnetizations at 40 kOe decrease with increasing x firstly for x ≤0.10, and then increase with increasing x further. The type of magnetic transition changes from first-order to second-order around x =0.10 with increasing x . Chemical composition-dependent MCE is also studied around T C . With increasing x , the maximal magnetic entropy changes decrease and the magnetic phase transitions broaden. Accordingly, the relative cooling power (RCP) increases with increasing x , reaching the largest values of ∼0.56 J/cm 3 (∼75 J/kg) and ∼1.66 J/cm 3 (∼221 J/kg) with the magnetic changes of 20 kOe and 48 kOe, respectively. Considering the large RCP, inexpensive, and innoxious raw materials, these serial samples Sn 1− x CMn 3+ x are suggested to be potential room-temperature magnetic refrigerant materials.