The redistribution of N towards the surface during implantation at temperatures ranging from ambient to 250C was studied in pure Fe by using nuclear reaction analysis and secondary ion mass spectrometric methods. It was found that radiation defects had an important effect upon N migration and trapping. The migration mechanism was identified as being radiation-induced segregation.

Radiation-Induced Segregation of Nitrogen Implanted into Iron. J.Jagielski, N.Moncoffre, G.Marest, L.Thomé, A.J.Barcz, G.Gawlik, W.Rosinski: Journal of Applied Physics, 1994, 75[1], 153-60