Abstract
Marked discontinuities are observed in the slope of the variation with gold concentration of the 57Fe isomer shift, linewidth and hyperfine field in the Mossbauer spectra of palladium gold (iron 2 at.%) alloys at around 50 at.% gold. These are associated with a decrease in the effectiveness of charge screening at the iron sites when the palladium d band is filled. The change from ferromagnetic behaviour in palladium iron alloys to random antiferromagnetic behaviour in gold iron alloys is shown to occur when the d band is filled. The observed Curie temperatures of palladium rich alloys are shown to be determined by the matrix susceptibility. A small change in the slope of the 197Au isomer shift variation in palladium gold alloys is observed at about 50 at.% gold which was not seen in the earlier experiment of Roberts et al. There is no anomalous behaviour in the linewidth variation, implying little change in the screening of the gold atoms when the d band is filled. Preliminary measurements on palladium copper (iron 1 at.%) alloys indicate a marked discontinuity in the 57Fe isomer shift variation at 50 at.% copper
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
