La_(1-x)Ca_xMn_(0.96)Fe_(0.04)O_3(x=0.31、0.5、0.6)的中子衍射研究  

Neutron Powder Diffraction Study of La_(1-x)Ca_(x)Mn_(0.96)Fe_(0.04)O_(3)(x=0.31,0.5,0.6)

作　　者：张莉[1] 薛艳杰[1] 张百生[1] 陈娜[1] 陈东风[1] 成昭华[2] 鲁毅[2] 李庆安[2] 邸乃力[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》2006年第4期402-405,共4页Atomic Energy Science and Technology

摘　　要：利用Rietveld分析方法对钙钛矿锰氧化物La1-xCaxMn0.96Fe0.04O3(x=0.31、0.5、0.6)室温下中子衍射实验数据进行拟合。结果表明,La1-xCaxMn0.96Fe0.04O3化合物具有MnO6八面体,空间群为Pnma,La(Ca)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晶位。根据拟合结果,计算出Mn O键的键长和Mn O Mn的键角,并对该系列样品结构和磁性能间的关系进行了简单讨论。The crystallographic structures of perovskite manganites La1-x Cax Mn0.96- Fe0. 04O3 （x=0. 31,0. 5,0. 6） were refined by Rietveld analysis of neutron diffraction data at room temperature. The refined results indicate that La1-xCax Mn0.96 Fe0.04 O3 （x= 0. 31,0. 5,0. 6） compound has MnO6 type （space group： Pnma） octahedral shape. The La/Ca atoms prefer to 4c sites, the Mn/Fe atoms prefer to 4b sites, and the O atoms prefer to 4c and 8d sites. The Mn-O bond distances and the Mn-O-Mn angles were obtained. The relationship between magnetic properties and structures is discussed.

关 键 词：中子粉末衍射 晶体结构 磁结构 

分 类 号：O722.7[理学—晶体学]