Nd_(0.5)Sr_(0.4)Pb_(0.1)Mn_(0.96)Fe_(0.04)O_3微观结构的中子衍射  

Neutron Diffraction on Micro-Structure of Nd_(0.5)Sr_(0.4)Pb_(0.1)Mn_(0.96)Fe_(0.04)O_3

作　　者：薛艳杰[1] 张莉[1] 陈娜[1] 肖红文[1] 陈东风[1] 鲁毅[2] 李庆安[2] 成昭华[2] 

机构地区：[1]中国原子能科学研究院核物理研究所,北京102413 [2]中国科学院物理研究所磁学国家重点实验室,北京100080

出　　处：《原子能科学技术》2005年第5期395-398,共4页Atomic Energy Science and Technology

摘　　要：采用固相反应法制备了混价钙钛矿型锰氧化物多晶样品Nd0.5Sr0.4Pb0.1Mn0.96Fe0.04O3,在室温下进行了中子粉末衍射测量并用Rietveld峰形精修程序Fullprof2k对实验数据进行了拟合。结果表明:Nd0.5Sr0.4Pb0.1Mn0.96Fe0.04O3样品具有正交的GdFeO3型结构,空间群为Pnma,Nd(Sr、Pb)原子占据4c晶位,Mn(Fe)原子占据4b晶位,O原子分别占据4c和8d两个不等价的晶位,并得到了MnO6八面体中Mn—O—Mn键角和Mn—O键的键长。The mixed valence perovskite-type manganite polycrystalline sample Nd0.5Sr0.4Pb0.1Mn0.96Fe0.04O3 was prepared using a standard solid-state reaction method. The powder neutron diffraction pattern was collected at room temperature, and the data were fitted using Rietveld profile refinement program. The Nd0.5Sr0.4Pb0.1Mn0.96Fe0.04O3 sample exhibits the orthorhombic GdFeO3 structure. The space group is Pnma. Nd（Sr,Pb） atoms occupy 4c sites, Mn（Fe） atoms occupy 4b sites, O atoms occupy 4c and 8d sites, respectively. The bond angles of Mn-O-Mn and bond lengths of Mn-O in the MnO6 octahedra are obtained.

关 键 词：钙钛矿型锰氧化物 中子粉末衍射 晶体结构 

分 类 号：O571.56[理学—粒子物理与原子核物理]