Impact of small Er rare earth element substitution on magnetocaloric properties of (La0.9Er0.1)0.6PB0.33MnO3 perovskite

In this work, the effect of Er substitution on the magnetic and magnetocaloric properties has been studied for (La0.9Er0.1)(0.6)PB0.33MnO3 perovskite synthesized by the sol-gel procedure. Magnetization measurements performed as a function of both temperature and magnetic field in order to determine magnetic and magnetocaloric properties. The temperature dependence of magnetization measured under 5 mT magnetic field indicate that sample exhibits ferromagnetic (FM) to paramagnetic (PM) transition with increasing temperature. The Curie temperature (T-C) decreases with Er-doping from 358 K for La0.67Pb0.33MnO3 to 349 K. From the isothermal magnetization measurements taken up to 5T around the T-C in 3 K intervals, the magnetic entropy change (Delta S-M) values of the sample have been determined for different magnetic fields. The Delta S(M)(max )value has been calculated as 0.98, 1.73, 2.33, 2.85 and 3.23 Jkg(-1)K(-1) for 1, 2, 3, 4 and 4.8 T, respectively. The type of magnetic phase transition has been determined as the second order from the slope of Arrott plots. (C) 2019 Elsevier B.V. All rights reserved.