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• W1499304187 abstract "Polycrystalline perovskite manganites La0.8Cd0.2−xKxMnO3 (x = 0.05, 0.075 and 0.1) were prepared by sol–gel method. The crystal structure examined by X-ray powder diffraction indicates that the samples were single phase and crystallize in a rhombohedral (R3¯c) structure with increasing the K content. Magnetization as a function of temperature, M(T), shows that these compounds exhibit a paramagnetic (PM) to ferromagnetic (FM) phase transition with decreasing temperature. The Curie temperature (TC) increases from 260 to 282 K as K-doping increases from 0.05 to 0.1.The resistivity measurements reveal that the samples exhibit a metallic to semiconductor transition and the electrical temperature transition TP presents a similar trend of TC, with increasing the K content. The magnetic entropy change |ΔSM| has been deduced by two methods: a Maxwell relation, and the Landau theory. The maximum value of the magnetic entropy change obtained from the M(H) plot data is |ΔSMmax|∼3.25Jkg−1K−1 for applied magnetic field of 2 T. At this value of magnetic field the relative cooling power (RCP) is 62.59 J kg−1. Close to TC, large change in magnetic entropy has been observed in all samples. Our result on magnetocaloric properties suggests that La0.8Cd0.2−xKxMnO3 compounds are attractive as a possible refrigerant for near room temperature magnetic refrigeration." @default.
• W1499304187 created "2016-06-24" @default.
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• W1499304187 date "2010-01-01" @default.
• W1499304187 modified "2023-09-26" @default.
• W1499304187 title "Effect of potassium doping on physical properties of perovskites La0.8Cd0.2−xKxMnO3" @default.
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• W1499304187 doi "https://doi.org/10.1016/j.jallcom.2009.09.063" @default.
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