PAC MEASUREMENTS IN LASER-DEPOSITED AG FE AND IN/FE ALLOYS/

Metastable, supersaturated alloys of the thermally immiscible systems Ag/Fe (< 16 at% Ag) and In/Fe (< 50 at% In) were produced by pulsed la ser deposition. The magnetic hyperfine interaction was studied via per turbed angular correlation spectroscopy using implanted In-111 tracers . In both systems the magnetic hyperfine fields B-n were found to decr ease linearly with the number n of Ag or In neighbor atoms next to the probe site (10.9% per Ag atom; 4.5% per In atom). From the observed d istribution of the fractions f(n) in the laser-deposited samples, the maximum solubility S = 15(5) at% of In in Fe was determined after lase r deposition. This concentration compares well with the maximum solubi lity S = 16(3) at% of Ag in Fe previously found for supersaturated Ag/ Fe alloys. The solubility of In in Fe in thermal equilibrium at room t emperature and at 970-1370 K was determined for samples having In conc entrations of less than 0.1-2.1 at%. (C) 1998 Elsevier Science B.V. Al l rights reserved.