Abstract
The rare earth - transition metal-indides GdPdIn, ErPdIn, YbPdIn,
YPtIn, TmPtIn, Dy4Pd10In21, PrPt2In2, and Tb2Pt7In16 were prepared by
arc-melting of the elements or by induction melting of the elements in
sealed tantalum tubes in a water-cooled sample chamber of a
high-frequency furnace. Single crystals of Dy4Pd10In21 and Tb2Pt7In16
were grown through special annealing procedures. The indides were
investigated via X-ray powder diffraction and all structures were
refined from X-ray single crystal diffractometer data: ZrNiAl type,
P(6) over bar 2, a = 767.8( 3), c = 390.7(2) pm, wR2 = 0.0722, 356 F-2
values for GdPdIn; a = 766.7(3), c = 376.7(1) pm, wR2 = 0.0433, 348 F-2
values for ErPdIn; a = 757.2(2), c = 393.59(8) pm, wR2 = 0.0388, 434
F-2 values for YbPdIn; a = 758.2(2), c = 384.95(8) pm, wR2 = 0.0643,
353 F-2 values for YPtIn; and a = 753.4(1), c = 376.71(4) pm, wR2 =
0.0844, 310 F-2 values for TmPtIn, with 14 variable parameters per
refinement. Dy4Pd10In21 crystallizes with the monoclinic Ho4Ni10Ga21
structure: C2/m, a = 2284.5(8), b = 441.0(2), c = 1931.4(7) pm, beta =
132.74(2)degrees, wR2 = 0.0419, 1690 F-2 values, 112 variable
parameters. PrPt2In2 adopts the CePt2In2 type: P2(1)/m, a = 1013.2(3),
b = 447.2(3), c = 1019.5(3) pm, beta = 116.69(2)degrees, wR2 = 0.0607,
1259 F-2 values, 63 variable parameters. Tb2Pt7In16 is the second
representative of the orthorhombic Dy2Pt7In16 type: Cmmm, a =
1211.6(2), b = 1997.1(4), c = 440.52(9) pm, wR2 = 0.0787, 1341 F 2
values, 45 variable parameters. The common structural motif of the four
different structure types are transition metal centered trigonal prisms
formed by the rare earth metal and indium atoms. These prisms are
condensed via common corners or via In-In bonds. The crystal chemistry
of the four different structure types is discussed.
