Structure Structure D 2000Ternary Aluminides with the Ideal Composition A 2 Pt 6 Al 15 (A: Y, Gd-Tm, Zr).-The title compounds are prepared by arc melting of the elements followed by annealing in a high-frequency furnace. The structures of the compounds are determined by powder XRD. Single crystal data are reported for Y1.357Pt4Al9.99 and Zr1.00Pt4Al10.22 (hexagonal, space group P63/mmc, Z = 1). -(NIERMANN,

The new cubic compound Fe0.5Ni0.5P3 (a = 775.29(5) pm) as well as the known compounds CoP3 and NiP3 were synthesized from the elemental components using tin as a flux. Their skutterudite (CoAs3) type structures were refined from single‐crystal X‐ray data. The new compound GdFe4P12 was prepared by reaction of an alloy Gd1/3Fe2/3 with phosphorus in a tin flux. Its cubic “filled” skutterudite (LaFe4P12 type) structure was refined from single‐crystal X‐ray data: a = 779.49(4) pm, R = 0.019 for 304 structure factors and 11 variable parameters. SmFe4P12 shows Van Vleck paramagnetism while GdFe4P12 is a soft ferromagnet with a Curie temperature of TC = 22(5) K. Both are metallic conductors. The new isotypic polyarsenide NdFe4As12 (a = 830.9(1) pm) was obtained by reacting NdAs2 with iron and arsenic in the presence of a NaCl/KCl flux. The new isotypic polyantimonide Eu0.54(1)Co4Sb12 (a = 909.41(8) pm) was prepared by reaction of EuSb2 with cobalt and antimony. Its structure was refined from single‐crystal X‐ray data to a residual of 0.024 (137 F values, 12 variables). A comparison of the Fe–P and P–P bond lengths in the compounds AFe4P12, where the A atoms (A = Ce, Eu, Gd, Th) have differing valencies, suggests that the Fermi level cuts through Fe–P bonding and P–P antibonding bands.

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structure structure (solids and liquids) D 2000 -003Crystal Structure and Properties of Some Filled and Unfilled Skutterudites: GdFe 4 P 12 , SmFe 4 P 12 , NdFe 4 As 12 , Eu 0.54 Co 4 Sb 12 , Fe 0.5 Ni 0.5 P 3 , CoP 3 , and NiP 3 .-The new compound Fe 0.5 Ni 0.5 P 3 as well as the isotypic known compounds CoP 3 and NiP 3 are synthesized by reaction of the elements in a tin flux (evacuated silica tube; 1. 450 • C, 1 d; 2. 675 • C. 7 d). These compounds crystallize in the cubic skutterudite (CoAs 3 ) type structure, space group Im3, Z = 8 (single crystal XRD). The compounds GdFe 4 P 12 , SmFe 4 P 12 , NdFe 4 As 12 , and Eu 0.54 Co 4 Sb 12 have a filled skutterudite (LaFe 4 P 12 ) type structure (space group Im3, Z = 2). The electric and magnetic properties of the compounds are briefly discussed. -(JEITSCHKO, WOLFGANG; FOECKER, ALOYS J.; PASCHKE, DIRK; DEWALSKY, MARTIN V.; EVERS, CH. B. H.; KUENNEN, BERND; LANG, ARNE; KOTZYBA, GUNTER; RODEWALD, UTE CH.; MOELLER, MAN-FRED H.