Structure of LaNi3.8AlMn0.2 Compounds Studied by Neutron Powder Diffraction

Wen Ze Han; Hao Guo; Kai Sun; De Min Chen; Shi Liu; Er Dong Wu; Yun Tao Liu; Dong Feng Chen

doi:10.4028/www.scientific.net/MSF.847.26

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HomeMaterials Science ForumMaterials Science Forum Vol. 847Structure of LaNi3.8AlMn0.2 Compounds Studied by...

Structure of LaNi_3.8AlMn_0.2 Compounds Studied by Neutron Powder Diffraction

Abstract:

The structures of as-cast LaNi_3.8AlMn_0.2 alloys and subsequent compounds by means of annealing at different temperature (850, 900, 950, 1000 ^oC) were examined by using neutron powder diffraction (NPD) and X-ray diffraction (XRD). Based on the Rietveld method, the diffraction data was refined using FullProf software. The refined results demonstrate the structure types of all compounds are CaCu₅ type and their space groups are P6/mmm. Increasing the annealing temperature, the lattice parameters of LaNi_3.8AlMn_0.2compounds did not possess clearly linear variation. It is noted that Mn atoms do not occupy the 2c sites but occupy the 3g sites in all compounds.

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Materials Science Forum (Volume 847)

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26-28

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.847.26

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Online since:

March 2016

Authors:

Wen Ze Han, Hao Guo, Kai Sun, De Min Chen, Shi Liu, Er Dong Wu, Yun Tao Liu, Dong Feng Chen

Keywords:

LaNi_3.8AlMn_0.2 Alloy, Mn Occupation, Neutron Powder Diffraction

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