Abstract
K 2U 2O 7 single crystals have been synthesized from a melt containing uranium, niobium oxides and potassium carbonate. The crystal structure of K 2U 2O 7 has been determined (space group R 3 ̄ m , a = 3.96(2) A ̊ , c = 19.82(4) A ̊ , Z = 3 2 ). This study led to three possible distributions for the oxygen vacancies: on the uranyl bond, on the oxygen atoms of the equatorial plane of the uranyl polyhedron or on both of these two sites. A Mössbauer ( 237Np) study of the isotypic compound K 2Np 2O 7 showed that the vacancies are located on the oxygen positions in the equatorial plane of the neptunyl ion. Mössbauer spectra of CaNpO 4 have been recorded at 4.2 K and 77 K. The isomeric shift value for this compound has been attributed to a neptunium(VI) ion with a coordination number of eight.
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.
