Substitution studies of Mn and Fe in Ln6W4Al 43 (Ln=Gd, Yb) and the structure of Yb6Ti 4Al43

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The synthesis and characterization of Mn- and Fe-substituted Ln 6W4Al43 (Ln=Gd, Yb) and Yb6Ti 4Al43 are reported. The compounds adopt the Ho 6Mo4Al43 structure type with lattice parameters of a~11 Å and c~17.8 Å with structural site preferences for Mn and Fe. The magnetization of Yb6W4Al43 is sensitive to Mn and Fe doping, which is evident by an increase in the field dependent magnetization. Gd6W4Al43, Gd6W 4Al42.31(11)Mn0.69(11), and Gd 6W4Al41.69(12)Fe1.30(12) order antiferromagnetically in the ab- and c-directions at 15, 14, and 13 K, respectively, with positive Weiss constants, suggesting the presence of ferromagnetic exchange interactions. Anisotropic magnetization data of Gd 6W4Al43-yTy (T=Mn, Fe) analogs are discussed. © 2013 Published by Elsevier Inc.

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Journal of Solid State Chemistry

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