Title

Magnetic Structures of Y₆(Fe₁₋ₓAlₓ)₂₃ Compounds

Abstract

Neutron diffraction studies of three Y6(Fe1-xAlx)23 compounds (x = 0.05, 0.10, 0.15) at 523 K and 77 K reveal substantial preferential atomic ordering of Fe and Al atoms on the four transition metal crystallographic sites. Fe atoms prefer to occupy the f1 site and Al atoms the f2 site. The site preferences are explained on the basis of the comparative atomic volumes and the nearest neighbor distances. At 77 K the compounds are ferromagnetic. The moments of the Fe atoms lie along the <111> direction and exhibit different magnetic moments on the four transition metal crystallographic sites. The decrease in the Curie temperature and magnetization of Y6Fe23 with increasing Al content arises as a result of two effects, dilution of the Fe sublattice with nonmagnetic atoms and changes in the preferential atomic ordering which governs the local enviroments of the Fe atoms so as to decrease the average Fe moment.

Department(s)

Chemistry

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1985 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.


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