Neutron diffraction study on composite compound Nd2Co7

doi:10.1088/1674-1056/20/10/106101

Abstract The crystallographic and the magnetic structures of the composite compound Nd₂Co₇ at 300 K are investigated by a combined refinement of X-ray diffraction data and high-resolution neutron diffraction data. The compound crystallizes into a hexagonal Ce₂Ni₇-type structure and consists of alternately stacking MgZn₂-type NdCo₂ and CaCu₅-type NdCo₅ structural blocks along the c axis. A magnetic structure model with the moments of all atoms aligning along the c axis provides a satisfactory fitting to the neutron diffraction data and coincides with the easy magnetization direction revealed by the X-ray diffraction experiments on magnetically pre-aligned fine particles. The refinement results show that the derived atomic moments of the Co atoms vary in a range of 0.7 μ_B-1.1 μ_B and the atomic moment of Nd in the NdCo₅ slab is close to the theoretical moment of a free trivalent Nd³⁺ ion, whereas the atomic moment of Nd in the NdCo₂ slab is much smaller than the theoretical value for a free Nd³⁺ ion. The remarkable difference in the atomic moment of Nd atoms between different structural slabs at room temperature is explained in terms of the magnetic characteristics of the NdCo₂ and NdCo₅ compounds and the local chemical environments of the Nd atoms in different structural slabs of the Nd₂Co₇ compound.

Keywords: Nd₂Co₇ neutron powder diffraction magnetic structure crystal structure

Received: 27 March 2011
Revised: 25 May 2011
Accepted manuscript online:

PACS:	61.05.cp	(X-ray diffraction)
	61.05.F-	(Neutron diffraction and scattering)
	75.25.-j	(Spin arrangements in magnetically ordered materials (including neutron And spin-polarized electron studies, synchrotron-source x-ray scattering, etc.))

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 50631040) and the National Basic Research Program of China (Grants Nos. 2006CB601101 and 2006CB605101).

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Yang Yu-Qi(杨育奇), Li Guan-Nan(李冠男), Wang Tong(王通), Huang Qing-Zhen(黄清镇), Gao Qing-Qing(高庆庆), Li Jing-Bo(李静波), Liu Guang-Yao(刘广耀), Luo Jun(骆军), and Rao Guang-Hui(饶光辉) Neutron diffraction study on composite compound Nd₂Co₇ 2011 Chin. Phys. B 20 106101

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Neutron diffraction study on composite compound Nd2Co7

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Neutron diffraction study on composite compound Nd₂Co₇