Abstract
The magnetic and magnetocaloric properties of Pr1−x Bi x MnO3 (x = 0.2 and 0.4) nanocrystalline manganites have been studied systematically. Samples were prepared using the Pechini sol–gel method. The variation of the magnetization as a function of temperature and applied magnetic field were carried out. Magnetic measurements show that all the materials exhibit a paramagnetic–ferromagnetic transition when the temperature decreases. Magnetocaloric effect has been calculated in terms of isothermal magnetic entropy change. A large magnetocaloric effect has been observed, the maximum entropy change, ${\Delta S}_{\mathrm {M}}^{\text {max}}$ ¦reaches 0.7 and 2.1 J kg−1 K−1 under a magnetic applied field of 5 T with an RCP values of 183 J kg−1 for Pr0.8Bi0.2MnO3 sample. These perovskites have the large magnetic entropy changes induced by low magnetic field change, which is beneficial for the household application of active magnetic refrigerant (AMR) materials.
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