Abstract
The influence of Bi3+ doping on the structure, magnetic and magnetocaloric properties of La0.7-xBixSr0.15Ca0.15MnO3 (x = 0, 0.05, 0.10, 0.15) was studied. The samples were prepared by the Pechini sol–gel method. The powder X-ray diffraction data demonstrates that the major phase of samples possesses a single perovskite structure with the Pbnm orthorhombic space group. Rietveld refined data shows that the lattice parameters and unit cell volume become large with an increase of Bi3+. The magnetization measurement demonstrates that the Curie temperature and relative cooling power decrease with the increase of Bi3+ content, while the maximum magnetic entropy change first increases with the increase of Bi3+ content, and then decreases. La0.6Bi0.1Sr0.15Ca0.15MnO3 exhibits a giant value of magnetic entropy (2.16 J/kg·K at around 291 K) under an applied magnetic field of 2 T, and the RCP for this compound is found accordingly as 99 J/kg, which can be used as one of the potential magnetic refrigerant materials close to room temperature.
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