La4Cu3-xZnxMoO12: Zinc-Doped Cuprates with Kagomé Lattices
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- 作者：Guobao Li ; Liping You ; Wutao Wei ; Yue Lu ; Jing Ju ; Anders Wannberg ; Hå ; kan Rundlö ; f ; Xiaodong Zou ; Tao Yang ; Shujian Tian ; Fuhui Liao ; Naoki Toyota ; and Jianhua Lin
- 刊名：Journal of the American Chemical Society
- 出版年：2005
- 出版时间：October 12, 2005
- 年：2005
- 卷：127
- 期：40
- 页码：14094 - 14099
- 全文大小：431K
- 年卷期：v.127,no.40(October 12, 2005)
- ISSN：1520-5126
文摘
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 bytraditional solid-state reactions. Their structures were determined from X-ray powder diffraction with thehelp of electron and neutron diffraction. The atomic arrangements of SS1 and SS2 are similar, but theirspace groups are different, Pmnm for SS1 and P-1 for SS2, respectively. The copper, zinc, and molybdenumare coordinated by oxygen in corner-sharing trigonal bipyramids that are sandwiched between layers oflanthanum cations. In the transition metal cations layer of SS2, the copper and zinc cations order into aKagomé-like lattice of triangular clusters. The magnetism has been measured from 2 to 300 K and is highlyinfluenced by the geometric arrangement of the CuII and ZnII cations. The number of free electrons perthree Cu atoms is close to one for all samples in SS1 and SS2 indicating that the system can be wellexpressed by independent CuII3 clusters. Spontaneous magnetization was observed in the system.
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 bytraditional solid-state reactions. Their structures were determined from X-ray powder diffraction with thehelp of electron and neutron diffraction. The atomic arrangements of SS1 and SS2 are similar, but theirspace groups are different, Pmnm for SS1 and P-1 for SS2, respectively. The copper, zinc, and molybdenumare coordinated by oxygen in corner-sharing trigonal bipyramids that are sandwiched between layers oflanthanum cations. In the transition metal cations layer of SS2, the copper and zinc cations order into aKagomé-like lattice of triangular clusters. The magnetism has been measured from 2 to 300 K and is highlyinfluenced by the geometric arrangement of the CuII and ZnII cations. The number of free electrons perthree Cu atoms is close to one for all samples in SS1 and SS2 indicating that the system can be wellexpressed by independent CuII3 clusters. Spontaneous magnetization was observed in the system.