Dy掺杂La2／3Ca1/3MnO3锰氧化物制备及低磁场下电输运性质  

Preparation and Electrical Transport Properties of Dy-doped La2/3Ca1/3MnO3 Manganese Oxides in the Low Field

作　　者：何宁[1,2] 李庆伦[2] 祁阳[2] 张彩碚[2] 

机构地区：[1]中国医科大学基础医学院,辽宁沈阳110001 [2]东北大学材料各向异性与织构教育部重点实验室,辽宁沈阳110819

出　　处：《纳米科技》2013年第4期17-21,共5页

基　　金：国家自然科学基金项目（10874022）

摘　　要：用溶胶-凝胶法制备了系列掺杂（La1-xDyx）2/3Ca1／3MnO3多晶纳米晶体，粒度在100nm左右。对系列样品电输运性质的研究表明，（La1-xDyx）2/3Ca1／3MnO3体系的电输运行为对Dy掺杂量极为敏感。随着Dy含量的增加，样品的转变温度向低温方向移动，峰值电阻显著变大；随着磁场的增加，其转变温度向高温方向略有移动；磁场增加引起的材料磁有序状态提高，使材料的磁电阻进一步变大。A series of Dy-doped （La1-xDyx）2/3Ca1/3MnO3 nanometer level crystals of about 100 nm sizes were prepared by sol-gel method. （La1-xDyx）2/3Ca1/3MnO3 series of samples research shows that,electrical transport properties of samples were not only affected by different Dy-doping content and magnetic field,but also closely related with Dy content. It is found that Tc of the samples decreases and peak resistance of samples increases with the increase of Dy content in the same field,and Tc of sample increases with increasing the field in the same Dy content. With the increase of the field, the improved material magnetic ordered state led to further increase of magnetoresistance of samples.

关 键 词：溶胶-凝胶法 纳米晶体 Dy掺杂 磁电阻 

分 类 号：O482.54[一般工业技术—材料科学与工程] TB34[理学—固体物理]