A red‐brown zirconium nitride was prepared by ammonolysis of ZrCl4. Chemical analysis leads to a composition of Zr3N4. It is not possible to distinguish between the space groups Pnam and Pna21 in the case of Zr3N4 using powder methods. The lattice constants are: a = 972.94(5) pm, b = 1081.75(6) pm, c = 328.10(1) pm (Z = 4). X‐ray powder diffraction data were used for structure refinement. The high temperature behavior was investigated with in situ XRD methods. Zr3N4 decomposes into ZrN and nitrogen gas at temperatures above 800°C.
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