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

Abstract

Intermetallic compounds SrNi 2 Si and BaNi 2 Si were prepared by arc-melting of stoichiometric mixture of the elements and subsequent annealing in welded niobium ampoules. Both compounds were investigated by X-ray diffraction on powder as well as single crystal methods. The title compounds both crystallize in the BaNi 2 Ge structure type (space group Pmmn, Z = 2), a ternary ordered variant of TiCu 3 : a = 4.0296(9) Å, b = 6.5121(14) Å, c = 5.6839(21) Å, R 1 = 0.040 for SrNi 2 Si and a = 4.0681(9) Å, b = 6.580(4) Å, c = 5.976(5) Å, R 1 = 0.031 for BaNi 2 Si. The structure contains corrugated polyanionic * Dr. V. Hlukhyy