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KatarinaDuriˇsandMartinJansen Cs NiO Revisited.CrystalStructureandMagneticProperties

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Cs

2

NiO

2

Revisited. Crystal Structure and Magnetic Properties

Katarina Duriˇs and Martin Jansen

Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany Reprint requests to Prof. Dr. Dr. h. c. Martin Jansen. Fax: +49 (0)711/689 1502.

E-mail: m.jansen@fkf.mpg.de

Z. Naturforsch.2012,67b,57– 60; received December 9, 2011

Single crystals as well as microcrystalline powders of Cs2NiO2were obtainedviathe azide/nitrate route from appropriate mixtures of CsN3, CsNO3 and NiO. The single-crystal structure analysis confirmed that Cs2NiO2crystallizes in the tetragonal space groupI4/mmm(Z = 2,a= 4.4090(3), c= 13.576(3) ˚A,R1 = 0.036,wR2 = 0.093). Above 45 K, Cs2NiO2is paramagnetic, and an analysis based on the Curie-Weiss law has resulted inµ = 2.89µBparamagnetic units,θ =−30.8 K and TN∼20 K.

Key words:High-spin Nickel(II) Compounds, Linear Coordination, Antiferromagnetic Ordering, Azide/Nitrate Route

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