Abstract
We have investigated the correlation between magnetocaloric and electrical properties of La0.47Pr0.2Pb0.33MnO3 perovskite prepared using the sol-gel method. Rietveld analysis of X-ray diffraction (XRD) pattern shows pure crystalline phase with rhombohedral . Magnetic entropy change, relative cooling power (RCP) and specific heat were predicted from M(T, H-0) data at different magnetic fields with the help of the phenomenological model. The magnetic entropy change reaches a maximum value of about 3.96J kg(-1) K-1 for H-0 = 5 T corresponding to RCP of 183J kg(-1). These values are relatively higher, making our sample a promising candidate for the magnetic refrigeration. Electrical-resistivity measurements were well fitted with the phenomenological percolation model, which is based on the phase segregation of ferromagnetic-metallic clusters and paramagnetic-semiconductor regions. The temperature and magnetic field dependences of resistivity data, (T, H-0), allowed us to determine the magnetic entropy change . Results show that the as-obtained magnetic entropy change values are similar to those determined from the phenomenological model.