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2005
Structure
D 2000
36- 011
Crystal Structures of the Ln3.33CuPb1.5Se 7 (Ln: Tb, Dy, Ho, Er, Tm, Yb and Lu)
Compounds. — As revealed by powder XRD the title compounds crystallize in the
space group Cm with Z = 2. The crystal structures can be derived from that of Y5Se 7.
The positions of the Y (Ln) atoms with octahedral coordination in Y5Se 7 and in the title
compounds are similar. Every position of the Y atom with trigonal prismatic coordination in Y5Se 7 corresponds to two defect positions of the atoms of the statistical mixture
M (Ln+Pb) or Pb in the structure of the title compounds in which an additional position
of the Cu atoms with tetrahedral coordination exists. — (GULAY*, L. D.;
OLEKSEYUK, I. D.; J. Alloys Compd. 396 (2005) 1-2, 233-239; Dep. Gen. Inorg.
Chem., Volyn State Univ., Lutsk 43009, Ukraine; Eng.) — W. Pewestorf
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