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- W2376432978 abstract "Layered perovskite manganites with a nominal chemsitry of Sm2-2xSr1+2x-2yCa2yMn2O7 (x=0.2, 0.3, 0.4, 0.5; y=0, 0.2, 0.3) were prepared using sol-gel method. The crystal structures of these compounds were studied by X-ray diffraction (XRD) and FTIR absorption spectra. The absorption peaks become weaker and move a little to higher frequency with increasing of Sm/Sr concentration. As the Sm doping increases to x=0.2 and x=0.3, the absorption peaks show a cubic structure character, reflecting that the samples suffer from a transition from tetragonal structure to cubic structure. This coincides with the X-ray diffraction results. The high temperature electrical properties were studied by conventional four-probe method. Although all samples exhibit the semiconductive behavior, lnρ-1 000/T curves are not linear and they obey the small polaron hopping mechanism. Moreover, the resistivity decreases with x reducing. This is due to that Sm doping increases the Jahn-Teller ion Mn3+ / Mn4+ ratio, and decreases the eg bandwidth." @default.
- W2376432978 created "2016-06-24" @default.
- W2376432978 creator A5052444278 @default.
- W2376432978 date "2006-01-01" @default.
- W2376432978 modified "2023-09-25" @default.
- W2376432978 title "Sol-Gel Synthesis and Electrical Properties of Layered Perovskite Type Sm_(2-2x)Sr_(1+2x-2y)Ca_(2y)Mn_2O_7 (x=0.2, 0.3, 0.4, 0.5; y=0, 0.2, 0.3)" @default.
- W2376432978 hasPublicationYear "2006" @default.
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