Abstract
Surface segregation on platinum emitters was studied by means of field emission microscopy and very high resolution Auger electron spectroscopy. Surfaces with the characteristic {100} ring structure (mainly Sigmund Cohn wire), which is stable to about 1500 K, were found to be phosphorus contaminated. When such emitters were heated between 870 and 1250 K, silicon as well as small amounts of S and C segregated to the {100} area and caused the ring the broaden. The latter shrank in size upon heating to above 1250 K, indicating a dissolution of Si in the Pt bulk. On other platinum surfaces (Materials Research wire), which showed after heat treatment a predominant Si contamination, {100} ring structures did not appear, instead, {012} planes developed in a temperature range of 870–1030 K. Vapor deposition of P on surfaces with very low P contamination and of Si on surfaces with very low Si contamination resulted in the appearance of {100} ring structures and {012} planes, respectively.
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.
