A systematic study on crystal structure and magnetic properties of Ln3GaO6 (Ln=Nd, Sm, Eu, Gd, Tb, Dy, Ho and Er)
A systematic study on crystal structure and magnetic properties of Ln3GaO6 (Ln=Nd, Sm, Eu, Gd, Tb, Dy, Ho and Er)
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系统研究Ln3GaO6（Ln=Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er）的晶体结构和磁性能
DOI：
10.1016/j.jssc.2003.12.024
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发表时间：
2004
影响因子：
3.3
通讯作者：
G. Rao
中科院分区：
文献类型：
--
作者：
F. S. Liu;Qiutian Liu;Junjun Liang;L. Yang;G. Song;J. Luo;G. Rao
研究了1400°C固相反应合成的系列化合物Ln_3GaO_6（Ln=Nd，Sm，Eu，Gd，Tb，Dy，Ho和Er）的晶体结构。X射线衍射分析表明，Ln 3GaO 6具有非中心对称的正交晶系结构（空间群Cmc 21）。晶格常数a、B、c和晶胞体积以及Ln（1）-O、Ln（2）-O间的平均距离均随三价Ln离子半径的减小而减小，这雅阁预期的镧系收缩行为。Ln原子与氧有两个七重配位，Ga原子处于氧四面体中，并沿a轴沿着方向扭曲拉长。磁化强度测量表明，磁化率χ随温度的变化符合居里型。
The crystal structures of a series of compounds with the composition Ln3GaO6(Ln=Nd, Sm, Eu, Gd, Tb, Dy, Ho and Er) synthesized by solid-state reaction at 1400°C are investigated. X-ray diffraction shows that Ln3GaO6has a non-centrosymmetric orthorhombic structure (space group Cmc21). Lattice parameters a,b,c and cell volume and the average distances between Ln(1)–O, Ln(2)–O of these compounds decrease with the decreasing of the radii of trivalent Ln ions, which accord with the expected lanthanide contraction behavior. There are two sites of seven-fold coordination for Ln atoms with oxygens, and Ga atoms are in oxygen tetrahedra which are distorted and elongated along the a-axis. Magnetization measurements indicate that the susceptibility χ changes with temperature in Curie-type manner.