二维Kagome结构RE3Sb3Zn2O14(RE=Tb,Dy,Ho)的制备及磁性  

Syntheses and Magnetic Properties of RE3Sb3Zn2O14(RE=Tb,Dy and Ho) with a New 2D Kagome Structure

作　　者：李锐[1,2] 车海亮 孙学峰 Li Rui;Che Hailiang;Sun Xuefeng(School of Science,Anhui Agricultural University,Hefei 230036,China;Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]安徽农业大学理学院,安徽合肥230036 [2]中国科学技术大学合肥微尺度物质科学国家研究中心,安徽合肥230026

出　　处：《稀有金属》2020年第3期333-336,共4页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(11874336);安徽省教育厅自然科学重点项目(KJ2017A135);安徽农业大学稳定与引进人才项目(WD2018-06)资助。

摘　　要：以非磁性的Zn2+替代立方烧绿石结构A2B2O7材料中三角层的磁性离子,通过传统的氧化物粉末固相反应法,经高温烧结得到了理想的二维Kagome结构磁阻挫新材料RE3Sb3Zn2O14(RE=Tb,Dy,Ho)多晶粉末。X射线衍射(XRD)结果表明:RE3Sb3Zn2O14具备菱形烧绿石结构,空间群为R3m。对比立方烧绿石结构A2B2O7材料,其最强衍射峰(222)(2θ=30°)已经劈裂为强度比约为3:1的两个衍射峰(2θ=29°,2θ=31.5°)。温度区间为2~300 K的直流磁化率测量结果表明,RE3Sb3Zn2O14样品的有效磁矩均略小于磁性离子的自由磁矩,外斯温度均为负值,表明磁性离子间为反铁磁相互作用;样品的磁化强度与外加磁场之间均为非线性响应关系,样品的饱和磁化强度均近似为各自有效磁矩值的一半,在2 K以上温度没有观察到磁有序现象。RE3Sb3Zn2O14材料在结晶结构上无缺陷,是研究二维(2D)稀土晶格上磁阻挫性质的理想材料。By traditional solid-state reaction of oxide powder,a new ideal two-dimensional Kagome structure materials-RE3 Sb3 Zn2 O14(RE=Tb,Dy,Ho) powders were obtained which the triangular-layer magnetic ions in cubic pyrochlore A2 B2 O7 materials were replaced by non-magnetic Zn2+.X-ray diffraction(XRD) results showed that the new materials crystallized in a rhombohedralsupercell of the cubic pyrochlore structure and the space group were R3 m.Comparison of cubic pyrochlore A2 B2 O7 materials,its strongest diffraction peak(222)(2θ=30°) had split into two diffraction peaks with an intensity ratio of about 3:1(2θ=29°,2θ=31.5°).As indicated by magnetic susceptibility measurements,the effective magnetic moment of the sample were slightly smaller than the free magnetic moment of the magnetic ions and the Weiss temperature were negative,indicating that the magnetic ions were antiferromagnetic interaction.The magnetization of the samples were nonlinear response to the applied magnetic field.The saturation magnetization of the samples were approximately half of the respective effective magnetic moment,and no magnetic ordering were observed at the temperature above 2 K.The RE3 Sb3 Zn2 O14 compounds appear to be relatively defect-free and were therefore model systems for investigating magnetic frustration on an ideal two-dimensional(2 D) rare earth Kagome lattice.

关 键 词：菱形烧绿石 二维Kagome结构 稀土元素 磁化率 

分 类 号：TB321[一般工业技术—材料科学与工程]