层状钙钛矿巨磁阻材料La_(1.2-x)Nd_xSr_(1.8)Mn_2O_7的微结构研究  

Microstructural Study of Layered Colossal Magnetoresistance Material La_(1.2-x)Nd_xSr_(1.8)Mn_2O_7

作　　者：王明光[1] 祁阳[1] 

机构地区：[1]东北大学理学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2009年第3期396-399,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(50572013)

摘　　要：利用X射线衍射仪(XRD)和透射电子显微镜(TEM)及高分辨电子显微镜(HREM)研究了层状巨磁电阻材料La1.2-xNdxSr1.8Mn2O7(x=0.2)的显微结构.研究结果表明,Nd掺杂氧化物La1.2Sr1.8Mn2O7仍具有四方对称性,即掺杂Nd没有改变原有的晶体结构.通过HREM观察发现,Nd掺杂氧化物La1.2Sr1.8Mn2O7含有较多的缺陷,其中包括与其他RP相形成的共生结构、(101)剪切结构以及一些比较复杂的缺陷结构.Abstract： The microstructure of layered colossal magnetoresistance material La1. 2 - xNdxSr1.8Mn2O7 （ x = 0.2） was investigated by X-ray diffraction （XRD）, transmission electron microscopy （TEM） and high-resolution electron microscopy （HREM）. The results showed that La1. 2 - xNdxSr1.8Mn2O7 （x = 0.2） is of tetragonal structure and Nd-doping has not evidently changed its structure. HREM results showed that many defects exist in the Nd-doped oxide La1. 2 - xNdxSr1.8Mn2O7, such as intergrowth structures formed between matrix and other RP phase, （101） crystallographic shear structures and some more complicated defective structures.

关 键 词：巨磁阻 高分辨电子显微镜 共生结构 结晶学 结晶学剪切结构 

分 类 号：O766[理学—晶体学]