Title :
Structural and magnetic properties of RFe6Ge6 (R=Y, Gd, Tb, Er)
Author :
Wang, Y.B. ; Wiards, D. ; Ryan, D.H. ; Cadogan, J.M.
Author_Institution :
Dept. of Phys., McGill Univ., Montreal, Que., Canada
fDate :
11/1/1994 12:00:00 AM
Abstract :
A series of RFe6Ge6 (B=Y, Gd, Tb, Er) compounds have been prepared by arc-melting. Structural studies using X-ray diffraction (XBD) show that all four as-cast alloys belong to the hexagonal P6/mmm space group with similar lattice parameters (for YFe 6Ge6, a=5.12 Å and c=4.07 Å). After annealing at 900°C for two weeks, both YFe6Ge6 and TbFe6Ge6 transform into the orthorhombic Cmcm structure. Mossbauer spectroscopy and magnetisation measurements show that all of the alloys are antiferromagnetically ordered at room temperature. We find a single Fe crystallographic site, consistent with the RFe6Ge6 structures. Both the room temperature 57Fe hyperfine field and the Neel temperature (TN) are largely independent of the rare-earth, being 14.9(1) T and 487 K respectively for YFe6Ge6
Keywords :
Mossbauer effect; Neel temperature; X-ray diffraction; annealing; antiferromagnetic materials; crystal structure; erbium alloys; gadolinium alloys; germanium alloys; iron alloys; magnetic structure; magnetisation; terbium alloys; yttrium alloys; 14.9 T; 2 week; 293 K; 487 K; 900 C; 57Fe hyperfine field; ErFe6Ge6; GdFe6Ge6; Mossbauer spectroscopy; Neel temperature; TbFe6Ge6; X-ray diffraction; YFe6Ge6; annealing; antiferromagnetic order; arc-melting; hexagonal P6/mmm space group; lattice parameters; magnetic properties; magnetisation; orthorhombic Cmcm structure; room temperature; single Fe crystallographic site; structural properties; Annealing; Erbium; Germanium alloys; Iron; Lattices; Magnetic properties; Magnetization; Spectroscopy; Temperature; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
