A Ferromagnetic Carbodiimide: Cr2(NCN)3


  • The authors acknowledge the financial support by the German Science Foundation (DFG). We would also like to thank Dipl.-Ing. Ludwig Stork for chemical assistance.


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The same, but different: Chromium(III) carbodiimide (see structure), the first ferromagnetic carbodiimide, was synthesized from CrCl3 and ZnNCN and was characterized by X-ray diffraction. Despite being isostructural with antiferromagnetic Cr2O3, Cr2(NCN)3 adopts a ferromagnetic ground state as shown by SQUID measurements and correlated density-functional theory. At low temperatures, the phase shows a slightly larger magnetization than maghemite.