NdSr_（1－x）M_xNiO_4（M＝Ca，Ba）的合成，结构和电学磁学性  

Synthesis ,Structure ,Electrical and Magnetic Properties of NdSr_(1-x)M_xNiO_4(M=Ca ,Ba)

作　　者：李思温[1] 任玉芳[1] 

机构地区：[1]中国科学院长春应用化学研究所稀土化学与物理开放实验室

出　　处：《应用化学》1994年第4期50-53,共4页Chinese Journal of Applied Chemistry

摘　　要：用固相法首次合成了ＮｄＳｒ＿（１－ｘ）Ｍ＿ｘＮｉＯ＿４（Ｍ＝Ｃａ：０．０≤１．０；Ｍ＝Ｂａ：０．０≤ｘ≤０．６）系列复合氧化物，并研究了其结构，红外光谱，电学性质和磁学性质。除ＮｄＣａＮｉＯ以正交晶系结晶外，其它试样的结构均属于四方晶系。ＩＲ谱显示随Ｃａ￣（２＋）离子含量的增加，ＮｄＳｒ＿（１－ｘ）Ｍ＿ｘＮｉＯ＿４的Ｎｉ－Ｏ键缩短，Ｃａ￣（２＋）和Ｂａ￣（２＋）引入ＮｄＳｒＮｉＯ＿４以取代Ｓｒ￣（２＋），使试样由金属性导电转变为半导体性导电；随Ｃａ￣（２＋）含量增加，试样的室温电阻率增大。７７～３００Ｋ磁化率与温度关系曲线显示，所有试样的Ｎｉ￣（３＋）都以低自旋状态存在。new series of solid solution NdSr1-xMxNiO4(M =Ca,0.0≤x≤1.0;M=Ba,0.0≤x≤0.6)were synthesized by solid state reaction method,and their structures, magneticand electical properties and IR spectra have been studied.All the samples crystallized in te-tragonal system,with exception of the NdCaNiO_4 which crystallized in orthorhombic sys-tem. IR spectra of NdSr1-x CaxNiO_4 showed that the lengths of two Ni-D bonds decreasewith the increase of Ca contents. The electric conduction changed from metalic type to semi-conductive type,when x≥0.4(M=Ca,Ba), and the room temperature resistivities of Nd-Sr1-xCax NiO_4 increased with the increase of Ca contents. Magnetic susceptibility measure-ments revealed that Ni￣(3+) ions in all the samples at 77～300K Were in low-spin state.

关 键 词：钙钡氧化物 复合氧化物 合成 结构 

分 类 号：O614.33[理学—无机化学]