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2005
Palladium
I 8000
07- 023
The First Palladium Tin Selenide: Pd7Sn 2Se 9.85. — Samples of Pd7Sn2Se9+x with
x = 0.5—0.85 are prepared by reaction of stoichiometric mixtures of the elements
(silica tube, argon, 750 °C, 15 h). The selenides crystallize in a new hexagonal structure
type, space group P63/mmc, Z = 2. The Pd atoms are in octahedral and square-planar
coordination of selenium. Layers of isolated PdSe6 octahedra are connected by faceand edge-sharing PdSe4 squares, whose Se atoms form anti-cuboctahedra, each centered by selenium atoms with fractional occupations from x = 0.5 to x = 0.85. Tin is
bonded to three Se and three Pd atoms forming a distorted trigonal antiprism. Measurements of the electrical conductivity and the magnetic susceptibility reveals metallic
Pauli-paramagnetic behavior. The electronic charge distribution based on quantum
mechanical calculations within the AIM theory is discussed. — (POCHA, R.;
JOHRENDT*, D.; Z. Anorg. Allg. Chem. 630 (2004) 13-14, 2468-2472; Fachbereich
Chem. Biochem., Ludwig-Maximilians-Univ., D-81377 Muenchen, Germany; Eng.)
— Schramke
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