Abstract
Abstract A 200 kV electron microscope has been used to make an in-situ study of disordering by the electron beam of the superstructure V244O320 containing an ordered arrangement of vanadium vacancies. For electron accelerating voltages of 150 kV and above the ordered structure is replaced by the cubic Bl-type containing a random distribution of vanadium vacancies. It is shown that the disordering mechanism involves only the displacement of vanadium atoms by primary incident electrons, giving a value for the vanadium atom displacement energy of 7·8 eV. Observations of the relative rates of decay of the superlattice reflections during disordering show a correlation with the coordination of the vanadium atoms in the structure. A numerical calculation of the expected rates of decay is in good agreement with those observed.
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.
