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- W2322343546 abstract "This paper presents the magnetocaloric properties of polycrystalline La <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>0.8-x</sub> Ag <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>x</sub> Ca <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>0.2</sub> MnO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3</sub> manganites (x = 0.0, 0.05, and 0.1) prepared by solid-state reaction. The results reveal that an Ag-concentration increase leads to a slight increase of the Curie temperature (T <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>C</sub> ), and broadens the ferromagnetic-paramagnetic phase-transition region. The temperature dependences of the magnetic entropy change, ΔS <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>m</sub> (T), for the samples have also been calculated using Maxwell's relation. As a function of temperature, -ΔS <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>m</sub> (T) curve shows the maximum value (denoted as |ΔS <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>max</sub> |) around T <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>C</sub> . The field dependences of |ΔS <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>max</sub> | and refrigerant capacity (RC) can be expressed by the power laws of |AS <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>max</sub> | = a × ΔH <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>n</sup> nand RC = b × AHN, respectively. Based on M(H) isotherms and the universal entropy method for the ΔS <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>m</sub> (T) data measured at different values of ΔH, we point out that the samples exhibit the crossover of the first-to-second-order phase transformation. A partial replacement of La by Ag in La <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>0.8-x</sub> Ag <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>x</sub> Ca <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>0.2</sub> MnO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3</sub> leads to modify the first-order to second-order phase transition in the samples." @default.
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- W2322343546 date "2016-07-01" @default.
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- W2322343546 title "Magnetic and Magnetocaloric Properties of La0.8–<italic>x</italic>Ag<italic>x</italic>Ca0.2MnO3Exhibiting the Crossover of First- and Second-Order Phase Transitions" @default.
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- W2322343546 doi "https://doi.org/10.1109/tmag.2016.2539204" @default.
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