The preparation of nitrides of chromium has been studied in detail. Oxygen free samples of Cr1.000Nx, x ranging from 0.997 to 0.980, have been prepared by equilibrating at temperatures from 850 to 1048 °C in one atmosphere pressure of nitrogen. Results of the temperature dependences of expansivity, lattice parameters, magnetic susceptibility and electrical resistivity of CrN of various compositions are reported. The antiferromagnetic → paramagnetic transformation in CrN exhibits temperature hysteresis and is shown to be a transformation of the first kind. The transformation temperature of Cr1.000N0.997 is 286 °K.
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Browne et al. (1970) studied this question.
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