Magnetocaloric Analysis of Novel Polycrystalline Sm0.5Sr0.4Nd0.1Mn1‐xTixO3(0≤x≤0.2) that Correlates Structural and Magnetic Properties

Abstract

AbstractThis article summarizes the impact of the Ti ion at the Mn site of polycrystalline Sm0.5Sr0.4Nd0.1MnO3 samples, exploring the correlation between the structural, microstructural, magnetic, and magnetocaloric properties through the solid‐state route. The Rietveld refinement pattern divulges that all samples are crystallized predominantly in the orthorhombic phase with the Pnma space group. Temperature‐dependent magnetic studies of Sm0.5Sr0.4Nd0.1Mn1‐xTixO3 (x=0, 0.1, 0.2) expose phase separation phenomena in the field cooling curve, where the first peak at 42 K corresponds to the antiferromagnetic charge ordering or spin orientation of spontaneous magnetization, and the second peak at 87 K, 75.91 K, and 74.28 K corresponds to the paramagnetic to ferromagnetic transition. The maximum magnetic entropy changes (ΔSM) at T=110 K are discerned to be 2.5 J Kg−1 K−1, 1.65 J Kg−1 K−1, and 1.31 J Kg−1 K−1, respectively. Normalization of ΔS values in Sm0.5Sr0.4Nd0.1Mn1‐xTixO3 (x=0, 0.1, 0.2) does not overlap the universal behavior at magnetic fields (1T ‐ 7T), confirming the existence of field‐induced second‐order magnetic transitions. The relative cooling power (RCP) values are found to be 777.96 J Kg−1, 255.28 J Kg−1, and 190.58 J Kg−1 respectively. Further, the enhancement of the working span temperature and the broadening of specific heat capacity peaks in Sm0.5Sr0.4Nd0.1Mn1‐xTixO3 (x=0.1, 0.2) samples make these materials a promising candidate to serve as operating substances in magnetic refrigeration.