La4Cu(3-x) Zn(x) MoO12:采用卡戈梅格子的添加的酸盐
Guobao Li1, Liping You, Wutao Wei
1State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China. liguobao@pku.edu.cn
Journal of the American Chemical Society
|October 6, 2005
概括
合成了两种新的固体溶液,La4Cu(3-x) Zn(x) MoO12 (SS1和SS2),并进行了结构性特征. 研究了它们的磁性特性,揭示了由阴离子排列影响的自发磁化.
科学领域:
- 固态化学 固态化学
- 材料科学是一种材料科学.
- 磁力学 磁力学 是一种
背景情况:
- 研究具有潜在磁性应用的新材料.
- 了解过渡金属氧化物中的结构性质关系.
研究的目的:
- 合成和描述两个新的固体溶液,La4Cu(3-x) Zn(x) MoO12 (SS1和SS2).
- 确定SS1和SS2的晶体结构和原子排列方式.
- 调查磁性属性及其依赖于阴子排序的情况.
主要方法:
- 传统的高温固态反应 (10251200°C).
- 用X射线粉碎衍射,电子衍射和中子衍射进行结构分析.
- 从2到300K的磁性敏感度测量.
主要成果:
- 成功合成了两个不同的固体溶液,SS1 (Pmnm) 和SS2 (P-1).
- 原子排列表现出相似之处,但与不同的空间组.
- 铜,和形成了三角形双金字塔,共享角落.
- 在SS2中,Cu (II) 和Zn (II) 电离子形成了Kagomé类格子.
- 磁性受到Cu (II) 和Zn (II) 电离子的几何排列的显著影响.
- 在合成材料中观察到自发磁化.
结论:
- 合成的La4Cu{3-x) Zn{x) MoO12材料具有独特的结构和磁性特性.
- 观察到的自发磁化与过渡金属酸的特定排列有关.
- 该系统可以用独立的Cu(II) 3集群来描述,每个3个Cu原子大约有一个自由电子.
相关概念视频
Ionic Crystal Structures
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Qualitative Analysis
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
For instance, group IV...


