双钙钛矿氧化物Sr_2FeMoO_6的微结构及磁性能  

The microstructure and magnetic properties of double-perovskite oxides Sr_2FeMoO_6

作　　者：王玉平[1,2] 杨新伟[2] 相宇博 刘雯慧 李金兰[2] 胡艳春[2] 

机构地区：[1]新乡学院物理与电子工程学院,河南新乡453000 [2]河南师范大学物理与电子工程学院,河南新乡453007

出　　处：《功能材料》2016年第7期7130-7134,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(U1304110)

摘　　要：采用传统高温固相反应法和溶胶-凝胶法制备了样品Sr_2FeMoO_6,分别记为1和2#样品。X射线衍射结果表明两种方法制备的样品均为单相,四方晶系,空间群为I4/m。在烧结温度和烧结时间等同的条件下,2#样品的Fe/Mo有序度比1#样品的有序度要高,溶胶-凝胶法更易影响FeO6八面体结构,且该方法提升了FeO6八面体的对称性。1和2#样品在300K温度下的单胞磁矩分别为1.88和2.17μB,热扰动和反位缺陷是影响单胞磁矩的重要因素。Sr2FeMoO6（SFMO）samples have been prepared by standard solid-state reaction and sol-gel method,which marked as 1 and 2#respectively.The crystal structure and magnetic properties for the ordered double perovskite oxides SFMO have been investigated.X-ray powder diffraction studies revealed that the both samples were single phase and had the I4/m symmetry.The Fe/Mo order of 2#sample was higher than that of 1#sample under the same sintering temperature and time.Sol-gel method was an effective way to alter the FeO6 octahedron and the symmetry of the octahedron has been improved.The unit cell magnetization at 300 K was1.88μBfor 1#and 2.17μBfor 2#,respectively.Thermal perturbation and the Fe/Mo anti-site defect are important reasons for the unit cell magnetization.

关 键 词：X射线衍射 扫描电镜 晶体结构 磁性材料 

分 类 号：TM205[一般工业技术—材料科学与工程]