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| B位掺杂钙钛矿结构化合物LaSr2Mn2-xFexO7的电磁性能 | |
| 引用本文： | 石兆辉,冯静,郭丽琴,孟健,张密林.B位掺杂钙钛矿结构化合物LaSr2Mn2-xFexO7的电磁性能[J].硅酸盐学报,2007,35(3):298-302. |
| 作者姓名： | 石兆辉 冯静 郭丽琴 孟健 张密林 |
| 作者单位： | 1. 哈尔滨工程大学化工学院,哈尔滨,150001 2. 哈尔滨工程大学化工学院,哈尔滨,150001;中国科学院长春应用化学研究所,稀土化学与物理重点实验室,长春,130022 3. 中国科学院长春应用化学研究所,稀土化学与物理重点实验室,长春,130022 |
| 基金项目： | 哈尔滨工程大学校科研和教改项目 , 高等学校博士学科点专项科研项目 |
| 摘 要： | 研究了以Fe离子(Fe3 )掺杂取代部分锰(Mn)离子的层状钙钛矿结构化合物LaSr2Mn2-xFexO7(O≤x≤O.3)的电性和磁性.结果发现:Fe3 的掺杂抑制了LaSr2Mn2-xFexO7低温的反铁磁性交换作用,使Neel温度TN由x=0的138K降至x=0.3的l0lK.同时,LaSr2Mn2-xFex07的自旋玻璃态、电荷有序和金属一绝缘体转变温度都由于Fe3 取代Mn离子而受到抑制.产生上述现象的原因是因为Mn位被取代导致产生无序状态.由于Fe3 取代Mn粒子,致使双交换作用通道被打破,化合物的电阻率随x的增加而迅速增加.所有化合物的电阻率在低温阶段都可以用Mott的变程跳跃理论来拟合;在高温阶段可以用最近小声子极化理论来拟合. |
| 关 键 词： | 磁阻 钙钛矿 电荷有序 双交换 |
| 文章编号： | 0454-5648(2007)03-0298-05 |
| 修稿时间： | 06 13 2006 12:00AM |
ELECTRICAL AND MAGNETIC PROPERTIES OF PEROVSKITE COMPOUND LaSr2Mn2-xFexO7 DOPED ON B-SITE |
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| SHI Zhaohui,FENG Jing,GUO Liqin,MENG Jian,ZHANG Milin.ELECTRICAL AND MAGNETIC PROPERTIES OF PEROVSKITE COMPOUND LaSr2Mn2-xFexO7 DOPED ON B-SITE[J].Journal of The Chinese Ceramic Society,2007,35(3):298-302. | |
| Authors: | SHI Zhaohui FENG Jing GUO Liqin MENG Jian ZHANG Milin |
| Affiliation: | 1. College of Material Science and Chemistry Engineering, Harbin Engineering University, Harbin 150001; 2. Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China |
| Abstract: | Effect of Fe 3 substitution for manganese(Mn)ions on magnetic and transport properties was investigated for layered perovskite compound LaSr2Mn2-xFexO7.The Fe 3 doping hampered the canted antiferromagnetic(AFM)exchange at low temperatures and their Neel temperature(TN)decreased from 138 K(x=0)to 101 K(x=0.3).Meanwhile,spin glass,charge ordering and metal-insulator transition were suppressed by Fe 3 addition.This can be ascribed to Mn site disorder caused by random substitution of Fe 3 .The resistivity increased obviously with x because the double exchange interaction channel was broken by Fe 3 addition.The resistivity of all samples in the low temperature range fit Mott's variable range hopping model;in the high temperature range,the resistivity fit the nearest-neighbor hopping model of small polarons. |
| Keywords: | magnetoresistance perovskite charge order double exchange |
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