Abstract
GdAgGe, GdAuGe, GdAu0.44(1)In1.56(1), and GdAuIn were prepared as single-phase materials from the elements by arcmelting and subsequent annealing at 970 K. The indium compounds were investigated by X-ray diffraction on both powders as well as single crystals. GdAu0.44(1)In1.56(1)adopts the CaIn2structure, a puckered version of the AlB2type:P63/mmc,a=478.9(1) pm,c=740.3(1) pm,V=0.1470(1) nm3,Z=2, wR2=0.0278, for 149F2values, and 8 variables. GdAuIn crystallizes with a ternary ordered variant of the Fe2P type:P62m,a=769.8(3) pm,c=397.8(2) pm,V=0.2042(1) nm3,Z=3, wR2=0.0562, for 505F2values, and 14 variables. GdAgGe crystallizes with the same structure, and GdAuGe adopts the NdPtSb type, a ternary ordered version of the CaIn2structure. Chemical bonding in GdAuIn was investigated by semiempirical band structure calculations. The strongest bonding interactions are found for the Au–In contacts, followed by Gd–Au and Gd–In, while the Gd–Gd interactions are much weaker. The four gadolinium compounds are antiferromagnets with Néel temperatures of 13.0, 16.9, 21.0, and 12.5 K for GdAgGe, GdAuGe, GdAu0.44(1)In1.56(1), and GdAuIn, respectively. No field-induced magnetic transitions are evident from the low-temperature magnetization data. The magnetic hyperfine interactions in these intermetallics were studied in detail by155Gd Mössbauer spectroscopy.
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