Abstract

Single crystals as well as microcrystalline powders of Cs2NiO2 were obtained via the azide/nitrate route from appropriate mixtures of CsN3, CsNO3 and NiO. The single-crystal structure analysis confirmed that Cs2NiO2 crystallizes in the tetragonal space group I4/mmm (Z = 2, a = 4.4090(3), c = 13.576(3) Å , R1 = 0.036, wR2 = 0.093). Above 45 K, Cs2NiO2 is paramagnetic, and an analysis based on the Curie-Weiss law has resulted in μ = 2.89 μB paramagnetic units, θ = −30.8 K and TN ∼ 20 K.

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