Synthesis, Structure, and Magnetic Properties of Sr₃₉Co₁₂N₃₁

Authors: Kowach G.R.; Lin H.Y.; DiSalvo F.J.

Source: Journal of Solid State Chemistry, Volume 141, Number 1, November 1998 , pp. 1-9(9)

Publisher: Academic Press

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Abstract:

Single crystals of Sr₃₉Co₁₂N₃₁ have been synthesized in liquid sodium from strontium, cobalt, and sodium azide at 1000°C in sealed niobium ampoules. The structure was solved by single-crystal X-ray diffraction (I m3m (No. 229), a= 14.910 Å, Z=2, R(F)=6.7%, R_w(F)=6.3%) with a disordered strontium position. Sr₃₉Co₁₂N₃₁ has a unique structure type incorporating coalt in linear coordination as isolated nitridometalate ions. All cobalt atoms are crystallographically equivalent, existing with a formal mixed valence of Co^I and Co^II. The magnetic susceptibility demonstrates antiferromagnetic Curie–Weiss behavior with an effective moment on cobalt of 4.99 _B, which lies in the range expected for that of high-spin ground states. Copyright 1998 Academic Press..