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Magnetic and Magnetocaloric Properties of Perovskite Pr0.5Sr0.5-xBaxMnO3
This paper studies the effects of A-site substitution by barium on the magnetic and magnetocaloric properties of Pr0.5Sr0.5-xBaxMnO3(x = 0, 0.04, 0.08 and 0.1). The tetragonal crystal structures of the samples are confirmed by room temperature X-ray diffraction. The dependence of the Curie temperature (TC) and the magnetic entropy change (ΔSM) on the Ba doping content has been investigated. The samples of all doping contents undergo the second order phase transition. As the concentration of Ba increased, the maximum entropy change (|ΔSM|max) increased gradually, from 1.15 J kg−1 K−1 (x = 0) to 1.36 J kg−1 K−1 (x = 0.1), in a magnetic field change of 1.5 T. The measured value of TC is 265 K, 275 K, 260 K and 250 K for x = 0, 0.04, 0.08 and 0.1, respectively. If combining these samples for magnetic refrigeration, the temperature range of ~220 K and 290 K, where |ΔSM|max is stable at ~1.27 J kg−1 K−1 and RCP = 88.9 J·kg−1 for ΔH = 1.5 T.Pr0.5Sr0.5-xBaxMnO3compounds, are expected to be suitable for magnetic-refrigeration application due to these magnetic properties.
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