YPd₂Al and YPd₂Zn with LiCu₂Sn Type Structure

Abstract

Abstract. The palladium-rich phases YPd 2 Al and YPd 2 Zn were synthesized from the elements; YPd 2 Al by arc-melting and YPd 2 Zn by induction melting in a sealed niobium ampoule. The structure of YPd 2 Al was refined from single-crystal X-ray diffractometer data: LiCu 2 Sn type, P6 3 /mmc, a = 433.9(2), c = 910.5(2) pm, wR 2 = 0.0497, 150 F 2 values, and 9 variables. The lattice parameters of YPd 2 Zn are a = 437.3(1) and c = 891.4(2) pm. The aluminum atoms in YPd 2 Al

SrNi2Si and BaNi2Si – New Layered Silicides with Fused Nickel Six‐membered Rings in a Boat Conformation

“…The homologues CaNi 2 Si and SrNi 2 Ge (Figure ) crystallize in the hexagonal LiCu 2 Sn type (space group P 6 3 / mmc ), Their structures contain polyanionic Ni 2 E layers ( E = Si, Ge), structurally closely related to that of the above discussed BaNi 2 Ge‐type, but with a chair conformation of corrugated Ni‐6 3 net. It should be noted that in the LiCu 2 Sn‐type structure as well as in its representatives, such as ErPt 2 Sn, GdPt 2 Sn, TbPt 2 Sn, TmPt 2 Sn, YPt 2 Sn, DyPt 2 In, GdPt 2 In, HoPt 2 In, TbPt 2 In, YPt 2 In, CePd 2 In, LaPd 2 In, YPd 2 Al, and YPd 2 Zn, the bonding pattern differs strongly: the T 2 E layers ( T = transition metals, E = p‐elements) are interconnected into a 3D network, whereas in CaNi 2 Si and SrNi 2 Ge such layers have a very pronounced two‐dimensional character.…”