Structural and Electrical Properties of Layered Pervoskite Manganites Nd2-2xSr1+2xMn2O7 （x=0.25, 0.3, 0.4）
来源期刊：Journal of Rare Earths2007年第6期
论文作者：裴健 陈刚 赵勇 线恒泽
文章页码：725 - 729
摘 要：Tetragonally layered perovskite manganites of Nd2-2xSr1+2xMn2O7 （x=0.25, 0.3, 0.4） were fabricated by using solid-state reaction technique. Structural characterization of the compounds was investigated by X-ray diffraction （XRD） and FT-IR absorption spectra. The XRD patterns revealed that all the samples were single phase. X-ray photoemission spectroscopy （XPS） was used to investigate their electronic structures. It was found that manganese was in mixed states of Mn3+ and Mn4+ whereas lattice oxygen and chemical absorbed oxygen were existed in all the samples. The high temperature electrical properties of Nd2-2xSr1+2xMn2O7 （x=0.3, 0.4） were measured by standard four-probe technique. The results showed that both compounds had semi-conductivity behavior in the temperature range of 300～1073 K, and the electrical conduction was dominated by thermally activated behavior above 500 K.
裴健，陈刚，赵勇，线恒泽
摘 要：Tetragonally layered perovskite manganites of Nd2-2xSr1+2xMn2O7 （x=0.25, 0.3, 0.4） were fabricated by using solid-state reaction technique. Structural characterization of the compounds was investigated by X-ray diffraction （XRD） and FT-IR absorption spectra. The XRD patterns revealed that all the samples were single phase. X-ray photoemission spectroscopy （XPS） was used to investigate their electronic structures. It was found that manganese was in mixed states of Mn3+ and Mn4+ whereas lattice oxygen and chemical absorbed oxygen were existed in all the samples. The high temperature electrical properties of Nd2-2xSr1+2xMn2O7 （x=0.3, 0.4） were measured by standard four-probe technique. The results showed that both compounds had semi-conductivity behavior in the temperature range of 300～1073 K, and the electrical conduction was dominated by thermally activated behavior above 500 K.
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