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| 钆掺杂巨磁阻材料Sr_2FeMoO_6正电子湮没谱 | |
| 引用本文： | 路庆凤,胡艳春,张星,徐勇光,张芹,李喜贵.钆掺杂巨磁阻材料Sr_2FeMoO_6正电子湮没谱[J].河南师范大学学报(自然科学版),2008,36(4). |
| 作者姓名： | 路庆凤 胡艳春 张星 徐勇光 张芹 李喜贵 |
| 作者单位： | 1. 河南师范大学,物理与信息工程学院,河南,新乡,453007 2. 黔西南民族师范高等专科学校,物理系 3. 山东交通大学数理学院,济南,250300 |
| 基金项目： | 国家自然科学基金 , 河南省教育厅自然科学基金 |
| 摘 要： | 采用固相反应法成功制备了钆掺杂样品Sr2-xGdxFeMoO6(x=0,0.05,0.1,0.15,0.2).X射线衍射对样品的检测结果表明,在整个掺杂范围内样品单相性很好;利用正电子湮没技术对样品缺陷进行了研究,掺杂使微缺陷复合成大的空位团,导致缺陷尺寸变大;采用标准四引线法测量了样品电阻率随温度变化,反位缺陷、缺陷尺寸及GdFeO3和GdMoO3团簇是影响样品电阻率的重要因素. |
| 关 键 词： | 正电子湮没 钆掺杂 Sr2FeMoO6 |
Positron Annihilation Study of Gd doping Effect on Colossal Magnetoresistance Material Sr2FeMoO6 |
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| LU Qing-feng,HU Yan-chun,ZHANG Xing,XU Yong-guang,ZHANG Qin,LI Xi-gui.Positron Annihilation Study of Gd doping Effect on Colossal Magnetoresistance Material Sr2FeMoO6[J].Journal of Henan Normal University(Natural Science),2008,36(4). | |
| Authors: | LU Qing-feng HU Yan-chun ZHANG Xing XU Yong-guang ZHANG Qin LI Xi-gui |
| Abstract: | Ceramic samples of Sr2-xGdxFeMoO6(x=0,0.05,0.1,0.15,0.2) are prepared by standard solid-state reaction.The X-ray diffraction pattern shows that all the samples are in single phase.Positron annihilation lifetime in Sr2-xGdxFeMoO6 is sensitive to the doping content.The size and the number of structural defects in these samples change with different doping content.Detailed analysis suggests that the anti-site defects,structural defects,and separated GdFeO3 or GdMoO3 domains are important reasons for resistivity. |
| Keywords: | positron annihilation Gd doping Sr2FeMoO6 |
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