Abstract
A new double metal nitride, SrNiN, and solid solutions Ca 1- x Sr x NiN (0 ≤ x ≤ 0.5) were prepared by the reaction of Sr 2N and/or α-Ca 3N 2 with nickel fine powder in a nitrogen atmosphere. SrNiN had an orthorhombic crystal lattice, Pnma, with a = 9.0859 Å, and b = 13.231 Å, and c = 5.2473 Å and was isostructural with BaNiN. The present products have crystal structures composed of infinite [NiN 2/2] 2- chains linked with tetrahedrally coordinated Sr 2+ and/or Ca 2+. The chain shapes are zigzag in SrNiN and linear in Ca 1- x Sr x NiN (0 ≤ x ≤ 0.5). Both crystal lattices have fcc nitrogen packing. The difference in chain shape can be understood in terms of a limited range of distortion in the tetrahedron supporting [NiN 2/2] 2- chains. All of these products were metallic conductors with residual electrical resistivities of order 10 -4 Ω cm at 10 K. Electrical resistivities at room temperature were 6.0 × 10 -3 Ω cm in SrNiN and 2-6 × 10 -4 Ω cm in Ca 1- x Sr x NiN. They showed temperature-independent magnetic behavior at temperatures down to 77 K.
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