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2005
Structure
D 2000
24- 009
Tb4FeGe8 Grown in Liquid Gallium: trans-cis Chains from the Distortion of a
Planar Ge Square Net. — The title compound is prepared by reaction of the elements
in a Ga flux (1000 °C, 5 h, 850 °C, 6 d; ≅70% yield). Single-crystal XRD results show
the existence of an orthorhombic average substructure (space group Cmcm, Z = 1,
CeNiSi2-type). The average structure consists of a three dimensional [Fe1/4Ge 2] framework where Ge atoms form a square net and Fe atoms reside alternatively above and
below this net. X-ray and electron diffraction studies reveal a modulation in the Ge net.
The modulated structure is refined based on a monoclinic supercell (space group
P21/n, Z = 4) and displays a severe distortion of the Ge square net with short and long
Ge—Ge bonds. — (ZHURAVLEVA, M. A.; BILC, D.; PCIONEK, R. J.; MAHANTI,
S. D.; KANATZIDIS*, M. G.; Inorg. Chem. 44 (2005) 7, 2177-2188; Dep. Chem.,
Mich. State Univ., East Lansing, MI 48824, USA; Eng.) — Schramke
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