山东建筑大学学报2017，Vol.32Issue(2)：132-136,182,6.
不同稀土离子掺杂对Ln0.8Sr1.2CoO4结构与磁性的影
Effects of different rare earth ions on structure and magnetic properties of Ln0.8Sr1.2CoO4
摘要
Abstract
K2 NiF4 type cobalt oxide usually shows many unique magnetic properties due to spin state transition and its quasi two dimensional layered structure.On account of hole doping effect on structure and their intricate low temperature magnetic properties,the Ln0.8 Sr1.2 CoO4 (Ln =La,Nd, Gd)samples were prepared with conventional solid state reaction method.The dc magnetization was carried out using the physical properties measurement system of quantum design.The relationship between the structure and magnetic properties in Ln0.8 Sr1.2 CoO4 was systematically studied.With the decrease of the average A-site ionic radius,the lattice parameters decrease,the Jahn-Teller distortion is enhanced,the Griffiths temperature decreases from 214.9 K to 159.9 K,and the Weiss temperature decreases from 89 .4 K to 7 .1 K,which suggests the suppression of ferromagnetism as well as the enhancement of antiferromagnetism.In the lower temperature region,the contribution of rare earth ions to the magnetization of samples is more obvious.The magnetization of Gd0.8 Sr1.2 CoO4 reaches to 36.42 emu/mol.Meanwhile,the change of chemical pressure effect leads to more low spin state of Co3+ions in Ln0.8Sr1.2CoO4,which results in the change of the magnetic state.关键词
离子掺杂/钙钛矿/钴氧化物/磁性Key words
perovskite/ion-doping/cobalt oxide/magnetism分类
数理科学引用本文复制引用
毛金花..不同稀土离子掺杂对Ln0.8Sr1.2CoO4结构与磁性的影[J].山东建筑大学学报,2017,32(2):132-136,182,6.基金项目
山东建筑大学博士基金项目(XNBS1267) （XNBS1267）
