La4Cu3-xZnxMoO12: Zinc-Doped Cuprates with Kagomé Lattices
La4Cu3-xZnxMoO12: Zinc-Doped Cuprates with Kagomé Lattices
复制标题
DOI：
10.1021/ja053489a
复制
发表时间：
2005-09
影响因子：
15
通讯作者：
Guobao Li;L. You;Wutao Wei;Yue Lu;Jing Ju;A. Wannberg;H. Rundlöf;X. Zou;Tao Yang;S. Tian;F. Liao;N. Toyota;Jianhua Lin
中科院分区：
文献类型：
--
作者：
Guobao Li;L. You;Wutao Wei;Yue Lu;Jing Ju;A. Wannberg;H. Rundlöf;X. Zou;Tao Yang;S. Tian;F. Liao;N. Toyota;Jianhua Lin
采用传统的固相反应法，在常压和1025 ~ 1200 °C的温度下合成了La 4Cu 3-xZnxMoO 12（0.05 ≤ x ≤ 0.20，SS 1）和La 4Cu 3-xZnxMoO 12（0.30 ≤ x ≤ 2.40，SS 2）两种固溶体。它们的结构由X射线粉末衍射和电子及中子衍射测定。SS 1和SS 2的原子排列相似，但它们的空间群不同，分别为SS 1的Pmnm和SS 2的P-1。铜、锌和钼与夹在镧阳离子层之间的共用角三角双锥中的氧配位。在SS 2的过渡金属阳离子层中，铜和锌阳离子有序排列成三角形簇的Kagome样晶格。的磁性已被测量从2至300 K和高度的CuII和ZnII阳离子的几何排列的影响。在SS_1和SS_2中，所有样品的每三个Cu原子的自由电子数都接近于1，这表明该体系可以很好地用于金属间化合物的制备。
Two solid solutions, La4Cu3-xZnxMoO12 (0.05 ≤ x ≤ 0.20, SS1) and La4Cu3-xZnxMoO12 (0.30 ≤ x ≤ 2.40, SS2), were synthesized at ambient pressure and at temperatures from 1025 to 1200 °C by traditional solid-state reactions. Their structures were determined from X-ray powder diffraction with the help of electron and neutron diffraction. The atomic arrangements of SS1 and SS2 are similar, but their space groups are different, Pmnm for SS1 and P-1 for SS2, respectively. The copper, zinc, and molybdenum are coordinated by oxygen in corner-sharing trigonal bipyramids that are sandwiched between layers of lanthanum cations. In the transition metal cations layer of SS2, the copper and zinc cations order into a Kagome-like lattice of triangular clusters. The magnetism has been measured from 2 to 300 K and is highly influenced by the geometric arrangement of the CuII and ZnII cations. The number of free electrons per three Cu atoms is close to one for all samples in SS1 and SS2 indicating that the system can be well...