| Effect of preparation procedure on the magnetic and transport properties of double perovskite Sr2FeMoO6 |
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| 引用本文： | 王锦辉,余智,刘公强,都有为. Effect of preparation procedure on the magnetic and transport properties of double perovskite Sr2FeMoO6[J]. 中国物理, 2004, 13(1): 90-94 |
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| 作者姓名： | 王锦辉 余智 刘公强 都有为 |
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| 作者单位： | Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China;Department of Chemistry, Nanjing University, Nanjing 210093, China;Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China; Chinese Centre of Advanced Science and Technology (CCAST) (World Laboratory), Beijing 100080, China;Department of Physics, Nanjing University, Nanjing 210093, China |
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| 基金项目： | Project supported by the State Key Development Program for Basic Research of China (Grant No 1999064508). |
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| 摘 要： | Ordered and disordered double perovskite Sr2FeMoO6 ceramics have been investigated by powder x-ray diffraction,magnetic and transport measurements, as well as Moessbauer spectroscopy. The heavily disordered sample can be acquired by annealing the ordered samples in argon. The annealing procedure affects not only the nature of grain boundaries but also the grain itself. The evidence of Moessbauer spectra performed at 77 and 300K indicates that there exist small oxygen deficient clusters of SrFeO3-y in the disordered sample. The paramagnetic Fe^4 and Fe^3 ions in the compound subsist down to 77K and the ratio of Fe^4 /Fe^3 increases with decreasing temperature.
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| 关 键 词： | 双重钙钛矿 磁阻 钼酸铁锶 X射线衍射 Moessbauer光谱 晶体相位 |
| 收稿时间： | 2003-02-10 |
Effect of preparation procedure on the magnetic and transport properties of double perovskite Sr2FeMoO6 |
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| Wang Jin-Hui,Yu Zhi,Liu Gong-Qiang and Du You-Wei. Effect of preparation procedure on the magnetic and transport properties of double perovskite Sr2FeMoO6[J]. Chinese Physics, 2004, 13(1): 90-94 |
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| Authors: | Wang Jin-Hui Yu Zhi Liu Gong-Qiang Du You-Wei |
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| Affiliation: | Department of Chemistry, Nanjing University, Nanjing 210093, China; Department of Physics, Nanjing University, Nanjing 210093, China; Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China; Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China; Chinese Centre of Advanced Science and Technology (CCAST) (World Laboratory), Beijing 100080, China |
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| Abstract: | Ordered and disordered double perovskite Sr_2FeMoO_6 ceramics have been investigated by powder x-ray diffraction, magnetic and transport measurements, as well as M?ssbauer spectroscopy. The heavily disordered sample can be acquired by annealing the ordered samples in argon. The annealing procedure affects not only the nature of grain boundaries but also the grain itself. The evidence of M?ssbauer spectra performed at 77 and 300 K indicates that there exist small oxygen deficient clusters of SrFeO_{3-y} in the disordered sample. The paramagnetic Fe^{4+} and Fe^{3+} ions in the compound subsist down to 77 K and the ratio of Fe^{4+}/Fe^{3+} increases with decreasing temperature. |
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| Keywords: | double perovskite magnetoresistance M?ssbauer spectra |
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