Synthesis and Structure of Oxygen Deficient Lead-Technetium Pyrochlore, the First Example of a Valence V Technetium Oxide

The structure of lead-technetium pyrochlore has been refined in space group [Formula: see text] with a = 10.36584(2) Å using a combination of synchrotron X-ray and neutron powder diffraction data and confirmed via Electron Diffraction. The oxide is found to be oxygen deficient with a stoichiometry o...

Descripción completa

Detalles Bibliográficos
Autores principales: Kennedy, Brendan J., Ablott, Timothy A., Avdeev, Maxim, Carter, Melody L., Losurdo, Linda, Saura-Muzquiz, Matilde, Thorogood, Kevin J., Ting, Jimmy, Wallwork, Kia S., Zhang, Zhaoming, Zhu, Hanliang, Thorogood, Gordon J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2021
Materias:
Chemistry
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8281135/
https://www.ncbi.nlm.nih.gov/pubmed/34277573
http://dx.doi.org/10.3389/fchem.2021.706269
Descripción
Sumario:The structure of lead-technetium pyrochlore has been refined in space group [Formula: see text] with a = 10.36584(2) Å using a combination of synchrotron X-ray and neutron powder diffraction data and confirmed via Electron Diffraction. The oxide is found to be oxygen deficient with a stoichiometry of Pb(2)Tc(2)O(7-d). Displacive disorder of the Pb cations is evident from the refinements, as has been observed in Bi(2)Tc(2)O(7-d). X-ray absorption spectroscopic measurements at the Tc K-edge demonstrate the valence of the Tc is greater than 4.0 as anticipated from the refined oxygen stoichiometry. Raman spectroscopy confirms the presence of disorder leading us to conclude that this pyrochlore is the first example of a valence V technetium oxide.

Ejemplares similares