Synthesis and Structure of Oxygen Deficient Lead-Technetium Pyrochlore, the First Example of a Valence V Technetium Oxide
Open Access
- 1 July 2021
- journal article
- research article
- Published by Frontiers Media SA in Frontiers in Chemistry
Abstract
The structure of lead-technetium pyrochlore has been refined in space group 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 Pb2Tc2O7-d. Displacive disorder of the Pb cations is evident from the refinements, as has been observed in Bi2Tc2O7-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.
Keywords
Funding Information
- Australian Nuclear Science and Technology Organisation
This publication has 43 references indexed in Scilit:
- Structural phase transitions and magnetic order in SrTcO3Dalton Transactions, 2011
- Structure studies on lanthanide technetium pyrochlores as prospective host phases to immobilize 99technetium and fission lanthanides from effluents of reprocessed used nuclear fuelsJournal of Nuclear Materials, 2011
- Antiferromagnetism in a Technetium Oxide. Structure of CaTcO3Journal of the American Chemical Society, 2011
- Preparation and Crystal Structures of Bismuth Technetates: A New Metal Oxide SystemInorganic Chemistry, 2008
- Structural Studies of TcO2by Neutron Powder Diffraction and First-Principles CalculationsJournal of the American Chemical Society, 2007
- Real-space refinement of single-crystal electron diffuse scattering and its application to Bi2Ru2O7−δJournal of Physics: Condensed Matter, 2007
- An Unexpected Crystal‐Chemical Principle for the Pyrochlore StructureEuropean Journal of Inorganic Chemistry, 2005
- Bismuth Ruthenium Oxides. Neutron Diffraction and Photoelectron Spectroscopic Study of Bi2Ru2O7 and Bi3Ru3O11Australian Journal of Chemistry, 1993
- Infrared-absorption characteristics of the pyrochlore structure*Journal of the Optical Society of America, 1973
- Crystal chemistry of some technetium-containing oxidesJournal of Inorganic and Nuclear Chemistry, 1964