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| Structural and Electrical Properties of Layered Pervoskite Manganites Nd2-2x Sr1＋2x Mn2O7 （x=0.25, 0.3, 0.4） | |
| 引用本文： | 裴健,;陈刚,;赵勇,;线恒泽. Structural and Electrical Properties of Layered Pervoskite Manganites Nd2-2x Sr1＋2x Mn2O7 （x=0.25, 0.3, 0.4）[J]. 中国稀土学报(英文版), 2007, 25(6): 725-729. DOI: 10.1016/S1002-0721(08)60015-0 |
| 作者姓名： | 裴健, 陈刚, 赵勇, 线恒泽 |
| 作者单位： | Pei Jian（Department of Applied Chemistry,Harbin Institute of Technology,Harbin 150001,China） ;Chen Gang（Department of Applied Chemistry,Harbin Institute of Technology,Harbin 150001,China） ;Zhao Yong（Department of Applied Chemistry,Harbin Institute of Technology,Harbin 150001,China） ;Xian Hengze（Department of Applied Chemistry,Harbin Institute of Technology,Harbin 150001,China） ; |
| 基金项目： | 国家自然科学基金;教育部海外归国学者科研基金 |
| 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 Mn^3＋ and Mn^4＋ 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. |
| 关 键 词： | 电学性质 水锰矿 晶体结构 电阻率 稀土 |
| 收稿时间： | 2007-02-05 |
| 修稿时间： | 31 May 2007. |
Structural and Electrical Properties of Layered Pervoskite Manganites Nd2 - 2x Sr1+2x Mn2O7 (x = 0.25, 0.3, 0.4) |
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| Pei , Chen Gang, Zhao Yong,Xian Hengze. Structural and Electrical Properties of Layered Pervoskite Manganites Nd2 - 2x Sr1+2x Mn2O7 (x = 0.25, 0.3, 0.4)[J]. Journal of Rare Earths, 2007, 25(6): 725-729. DOI: 10.1016/S1002-0721(08)60015-0 | |
| Authors: | Pei Chen Gang Zhao Yong Xian Hengze |
| Affiliation: | aDepartment of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, China |
| Abstract: | Tetragonally layered perovskite manganites of Nd2 - 2x Sr1+2x Mn2O7 (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 - 2x Sr1+2x Mn2O7 (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. |
| Keywords: | layered perovskite manganites crystal structure FT-IR resistivity rare earths |
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