Crystal chemistry and magnetic behaviour of the ternary compounds RE3(Au, Pt)xGa
11−x (RE = Y, Gd, Tb, Dy, Ho, Er, Tm and Yb)

Grin, Yu.; Ellner, M.; Hiebl, K.; Rogl, P.; Sichevich, O. M.; Myakush, O. M.

doi:10.1016/0925-8388(94)90803-6

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Crystal chemistry and magnetic behaviour of the ternary compounds RE₃(Au, Pt)_xGa_11−x (RE = Y, Gd, Tb, Dy, Ho, Er, Tm and Yb)

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Grin, Y., Ellner, M., Hiebl, K., Rogl, P., Sichevich, O. M., & Myakush, O. M. (1994). Crystal chemistry and magnetic behaviour of the ternary compounds RE₃(Au, Pt)_xGa_11−x (RE = Y, Gd, Tb, Dy, Ho, Er, Tm and Yb). Journal of Alloys and Compounds, 205(1-2), 285-289. doi:10.1016/0925-8388(94)90803-6.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-90DA-5

Abstract

Phases of composition RE3AuxGa11-x (RE=Y, Gd, Th, Dy, Ho, Er, Tm and Yb) and RE3PtGa11-x (RE = Y, Th, Dy, Ho, Er, Tm and Yb) have been synthesized from the elements by arc- or HF-melting followed by heat treatment at 600-degrees-C. Yb3Au5.5Ga5.5 crystallizes with a unique structure type, all other compounds belong to the La3Al11 structure type. Isotypism of the new compound Yb3Au4.8Ga6.2 with La3Al11 has been established from X-ray powder diffraction data using full profile refinement (space group Immm, a = 4.3684 angstrom, b = 12.976 angstrom, c = 9.4686 angstrom). Only partially ordered substitution of the Al-sites by Ga and Au has been found. The magnetic properties have been studied over the temperature range 4-550 K. Above liquid nitrogen temperature (LNT), the magnetic behaviour of all compounds investigated, with the exception of the ytterbium phases, corresponds to the paramagnetism of tripositive rare earth ions. Below LNT, antiferromagnetic ordering has been found for Gd3Au3.6Ga7.4 and (Tb, HO)3Pt2.2Ga8.8; a metamagnetic transition occurs for (Tb, Dy, Ho)3Au3.8Ga7.2 as well as Dy3Pt2.2Ga8.8, whereas (Er, Tm)3Au3.8Ga7.2 appear to be ferromagnets. The yttrium compounds are very weak, temperature-independent paramagnets. For both Yb3AuGa11-x compounds, ytterbium atoms adopt the non-magnetiC Yb2+ ground state, resulting in temperature-independent magnetic susceptibility over the whole temperature range studied. Yb3PtGa9, however, reveals a small magnetic moment (1.1 mu(B) per Yb atom), possibly due to intermediate valence behaviour.