| La_(0.5)Sm_(0.2)Sr_(0.3)MnO_3/Ag_x二相复合体的结构及磁电阻 |
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| 引用本文： | 王桂英,彭振生,唐永刚,刘鹏,牛晓飞. La_(0.5)Sm_(0.2)Sr_(0.3)MnO_3/Ag_x二相复合体的结构及磁电阻[J]. 稀有金属, 2010, 34(2). DOI: 10.3969/j.issn.0258-7076.2010.02.009 |
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| 作者姓名： | 王桂英 彭振生 唐永刚 刘鹏 牛晓飞 |
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| 作者单位： | 1. 宿州学院自旋电子与纳米材料安徽省重点实验室,安徽,宿州,234000
2. 宿州学院自旋电子与纳米材料安徽省重点实验室,安徽,宿州,234000;中国科学技术大学结构分析重点实验室,安徽,合肥,230026 |
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| 基金项目： | 国家自然科学基金重点项目，安徽省教育厅自然科学研究重大项目，安徽省教育厅自然科学研究项目，安徽省教育厅自然科学研究项目 |
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| 摘 要： | 用固相反应法制备La0.5Sm0.2Sr0.3MnO3/(Ag2O)x/2(x=0.00,0.04,0.08,0.25,0.30)样品,通过X射线衍射谱线(XRD),扫描电子显微镜(SEM)照片及SEM能谱(EDS),ρ-T曲线,研究样品的输运行为及磁电阻效应。结果表明:少量掺杂时Ag全部挥发。掺杂量较多时,挥发后多余的Ag主要以金属态包覆在母体颗粒的表面,使体系形成两相复合体。掺Ag为30%摩尔比时,样品的电阻率较低掺杂样品的电阻率降低一个数量级,在300K、0.5T磁场下,磁电阻明显增强,达到9.4%,这与颗粒母体界面结构的改善有关,也与材料电阻率的降低有关。
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| 关 键 词： | 室温低场磁电阻 晶界磁电阻 二相复合体 钙钛矿锰氧化物 |
Structure and Magnetoresistance of La_(0.5)Sm_(0.2)Sr_(0.3)MnO_3/Ag_x Two-Phase Composite |
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| Wang Guiying,Peng Zhensheng,Tang Yonggang,Liu Peng,Niu Xiaofei. Structure and Magnetoresistance of La_(0.5)Sm_(0.2)Sr_(0.3)MnO_3/Ag_x Two-Phase Composite[J]. Chinese Journal of Rare Metals, 2010, 34(2). DOI: 10.3969/j.issn.0258-7076.2010.02.009 |
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| Authors: | Wang Guiying Peng Zhensheng Tang Yonggang Liu Peng Niu Xiaofei |
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| Affiliation: | Wang Guiying1,Peng Zhensheng1,2,Tang Yonggang1,Liu Peng1,Niu Xiaofei1(1.Anhui Key Laboratory of Spintronics , Nano-Materials Research,Suzhou College,Suzhou 234000,China,2.Structure Research Laboratory,University of Science , Technology of China,Hefei 230026,China) |
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| Abstract: | La_(0.5)Sm_(0.2) Sr_(0.3) MnO_3/( Ag_2O)_(x/2) (x = 0.00, 0.04, 0.08, 0.25, 0.30) samples were prepared using the solid-state reac-tion method, and their transport behavior and magnetoresistance effect were studied through X-ray diffraction( XRD), scanning electron mieroscope(SEM) photos, energy dispersion spectrum(EDS) of SEM and p-T curves. The results showed that: Ag volatilized com-pletely when the doping amount was small. Ag was mainly distributed at the grain boundary of the mother body and was in metallic state when the doping amount was relatively larger, then the system became a two-phase composite. The resistivity of the sample doped with 30% Ag was one order of magnitude smaller than that of low-doped samples, and its magnetoresistance in the magnetic field of 0.5 Tand at 300 K strengthens increased apparently and reached 9.4%. This was due to the improvement of grain-haundary structure of the mother body and the decrease of material resistivity. |
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| Keywords: | room-temperature and low-field magnetoresistance grain-boundary magnetoresistance two-phase composite perovskite manganite |
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