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New ytterbium compounds with the BaAl4 type of structure: crystal chemistry and magnetic properties of Yb(Cu,Ag,Au,Pd,Pt)xGa4 - x

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Grin, Y. N., Ellner, M., Hiebl, K., & Rogl, P. (1993). New ytterbium compounds with the BaAl4 type of structure: crystal chemistry and magnetic properties of Yb(Cu,Ag,Au,Pd,Pt)xGa4 - x. Journal of Alloys and Compounds, 196(1-2), 207-212. doi:10.1016/0925-8388(93)90597-G.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-90F3-B
Abstract
Ternary samples with the composition Yb(Cu,Ag,Au,Pd,Pt)xGa4-x have been synthesized from the elements by high frequency melting followed by heat treatment at 600-degrees-C. The crystal structure of all compounds was investigated using X-ray single-crystal or powder techniques and belongs to the BaAl4 type of structure. The homogeneity regions of the Yb(Cu,Ag,Au,Pd,Pt)xGa4-x phases have been established from X-ray powder diffraction analyses and lie in the range x = 0.30-0.95 for Cu, 0.25-0.43 for Ag, 0.22-1.45 for Au, 0.23-0.65 for Pt and near x = 0.25 for Pd. The unit cell dimensions vs. composition reveal a significant deviation from Vegard's rule for Cu and Au and a slight deviation for Ag and Pt. A partially ordered occupation of the 4d and 4e sites in the BaAl4 structure type has been found depending on the M/Ga ratio in the homogeneity range. The weak temperature-dependent paramagnetism of these compounds is due to the non-magnetic ground state of ytterbium (Yb2+). However, for YbPt0.5Ga3.5 a rather intermediate valence behaviour (Yb2+ --> Yb3+) is encountered.