THE MAGNETIZATION OF ALPHA''FE16N2

Powder and foils containing up to 40% alpha''Fe16N2 have been prepared by annealing nitrogen-martensite. The magnetization of the alpha'' ph ase is deduced from magnetization measurements, coupled with a quantit ative phase analysis based on Mossbauer spectra. At room temperature t he values are 225-270 J T-1 kg(-1) corresponding to J(S) = 2.1-2.5 T. The average iron moment at T similar to 0 K is 2.3-2.6 mu(B), which is in accord with the results of spin-polarized band structure calculati ons.