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2005
Structure
D 2000
23- 004
Ternary Thallides LnMgTl (Ln: Y, La—Nd, Sm, Gd—Tm, Lu). — The title compounds are prepared from the elements (sealed tantalum tubes, high-frequency furnace,
≅1500 K, 10 min). The structures are determined by powder XRD and single crystal
XRD for the compounds YMgTl, LaMgTl, CeMgTl, and SmMgTl. The isotypic
LnMgTl compounds crystallize in the hexagonal space group P62m with Z = 3
(ZrNiAl type structure). The structures contain two cystallographically independent
thallium sites, both with tri-capped trigonal prismatic coordination. The Mg and Tl
atoms form a three-dimensional [MgTl] network with Mg—Mg distances of 327 pm
and Mg—Tl distances in the range 299—303 pm (data for CeMgTl). — (KRAFT, R.;
POETTGEN*, R.; Z. Naturforsch., B: Chem. Sci. 60 (2005) 3, 265-270; Inst. Anorg.
Anal. Chem., Westfael. Wilhelms-Univ., D-48149 Muenster, Germany; Eng.) —
Schramke
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