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- W2001025982 abstract "Previous studies on lacunar Ln0.7−xA0.3MnO3 and Ln0.7A0.3−xMnO3 with Ln = Pr, Nd and A = Sr, Ba perovskite manganese oxides have shown that their magnetic and electrical properties depend strongly on the nature of the deficient-element. In order to confirm such behaviour, we investigate the effects of lanthanum and calcium deficient upon the physical properties of La0.7Ca0.3MnO3 oxide. La0.7Ca0.3−x□xMnO3 and La0.7−x□xCa0.3MnO3 powder samples have been elaborated by the conventional ceramic method at 1400 K. All our synthesized samples are single phase and exhibit a paramagnetic to ferromagnetic transition with decreasing temperature. With increasing vacancy content, the Curie temperature decreases in the calcium-deficient samples and increases in the lanthanum-deficient ones. With increasing x from 0 to 0.2, TC is found to decrease from 218 to 180 K in the first series and to increase from 218 to 248 K in the second one. Resistivity measurements versus temperature showed that all lanthanum-deficient samples exhibit a semiconducting–metallic transition with decreasing temperature, however, such transition has been observed only for low x values (x ≤ 0.1) in the calcium-deficient samples. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)" @default.
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- W2001025982 date "2004-05-01" @default.
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- W2001025982 title "Magnetic and electrical properties of the lacunar La0.7 Ca0.3−x □x MnO3 and La0.7−x □x Ca0.3 MnO3 oxides" @default.
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- W2001025982 doi "https://doi.org/10.1002/pssc.200304442" @default.
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