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• W2007068999 abstract "We report a systematic study of the magnetic and magnetocaloric properties of La0.7Ca0.3Mn1-xFexO3, where trivalent Fe is substituted for Mn on the perovskite B-site in the doping range 0.00≤x≤0.07. The polycrystalline materials were prepared by a standard solid state reaction method and X-ray diffraction confirmed that Fe was incorporated without significant structural changes. Magnetic measurements indicate that the ferromagnetic double exchange interaction is weakened with increasing Fe concentration, resulting in a shift in TC from 263 K to 114 K as x varied between 0.00 and 0.07. The large entropy change of 7.7 J/kg K found in the sample with x=0 for a field change of 3 T is initially enhanced to 8.6 J/kg K for x = 0.01, which is likely due to oxygen deficiency. As Fe content increased further, peak entropy values were seen to decline. However, a simultaneous broadening of the ΔSM(T) peaks led to enhanced refrigerant capacity (RC) in the Fe-doped samples of up to 30% over that of La0.7Ca0.3MnO3. Arrott plot analyses and a universal curve method were applied to study the order of the magnetic transition in this system. The incorporation of Fe led to a weakening of first-order nature of the paramagnetic to ferromagnetic transition in La0.7Ca0.3MnO3 and finally initiated a change from first to second order for x &gt; 0.05." @default.
• W2007068999 created "2016-06-24" @default.
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• W2007068999 date "2012-12-01" @default.
• W2007068999 modified "2023-10-18" @default.
• W2007068999 title "Magnetic phase transitions and magnetocaloric effect in La0.7Ca0.3Mn1-<i>x</i>Fe<i>x</i>O3 0.00 ≤ <i>x</i> ≤ 0.07 manganites" @default.
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• W2007068999 doi "https://doi.org/10.1063/1.4768175" @default.
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