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200517.fm Page 29 Friday, March 18, 2005 2:52 PM
2005
Platinum
I 8300
17- 029
Dibariumplatinide: (Ba2+)2Pt2-·2e- and Its Relation to the Alkaline-Earth-Metal
Subnitrides. — Shiny-black microcrystals of Ba2Pt are synthesized from the elements
in Ta tubes under Ar (1223 K, 2 d). As revealed by powder XRD the compound crystallizes in the rhombohedral space group R3m (Z = 3) and adopts the CdCl2 type structure. Ba2Pt contains isolated Pt 2- ions, exhibits temperature independent diamagnetism,
and its electrical conductivity is of metallic character. The compound is further characterized by LMTO-TB-ASA band structure calculations. — (KARPOV, A.; WEDIG,
U.; DINNEBIER, R. E.; JANSEN*, M.; Angew. Chem., Int. Ed. 44 (2005) 5, 770-773;
MPI Festkoerperforsch., D-70569 Stuttgart, Germany; Eng.) — W. Pewestorf
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