Magnetic entropy change in perovskite manganites La0.7A0.3MnO3 La0.7A0.3Mn0.9Cr0.1O3 (A = Sr, Ba, Pb) and Banerjee criteria on phase transition

The La0.7A0.3MnO3, La0.7A0.3Mn0.9Cr0.1O3 (A = Sr, Ba, Pb) polycrystalline perovskite manganites sample was prepared by the sol–gel technique. The replacement of partial Mn3+/Mn4+ by Cr3+ (Cr3+ with the same electronic configuration as Mn4+) cause the variety of magnetocaloric property and magnetic entropy change. The maximum magnetic entropy change ΔSH = −1.16 J/kg K and the Relative Cooling Power (about 43.3 J/kg) were obtained from La0.7Sr0.3Mn0.9Cr0.1O3 in the Cr3+ doped series under 1 T magnetic field variation. On this paper, Banerjee criteria had been remarked to distinguish the first-order or second-order phase transition on phase transition of the doped perovskite manganites.

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► The magnetic entropy of manganite was studied by replacement of partial Mn3+ by Cr3+.
► Cr ion was taken on Cr3+ by the binding energy of XPS.
► Banerjee criteria were remarked to distinguish the first-order phase transition.