On the determination of ternary segregation parameters

In the ternary Fe-Mo-N system, molybdenum and nitrogen co-segregate to the iron surface, rendering seven segregation parameters to be determined. In t his article a novel experimental setup was used to minimize the number of p arameters with the help of a binary system. Nitrogen was absorbed on a Fe ( 1 0 0) surface, providing the driving force for molybdenum to segregate to the surface. The segregation parameters of molybdenum, i.e. the bulk diffus ion coefficient D and the segregation energy DeltaG in a Fe (1 0 0) single crystal could then be determined in the temperature range between 790 and 8 75 K and were found to be in the same order of magnitude as the tracer diff usion values. (C) 2001 Elsevier Science Ltd. All rights reserved.