An unconventional method for measuring the Tc L3-edge of technetium compounds

An unconventional method for measuring the Tc L3-edge of technetium compounds

Tc L3-edge XANES spectra have been collected on powder samples of SrTcO3 (octahedral Tc(4+)) and NH4TcO4 (tetrahedral Tc(7+)) immobilized in an epoxy resin. Features in the Tc L3-edge XANES spectra are compared with the pre-edge feature of the Tc K-edge as well as other 4d transition metal L3-edges....

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Veröffentlicht in:Journal of synchrotron radiation. - 1994. - 21(2014), Pt 6 vom: 01. Nov., Seite 1275-81
1. Verfasser: Blanchard, Peter E R (VerfasserIn)
Weitere Verfasser: Reynolds, Emily, Kennedy, Brendan J, Ling, Chris D, Zhang, Zhaoming, Thorogood, Gordon, Cowie, Bruce C C, Thomsen, Lars
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2014
Zugriff auf das übergeordnete Werk:Journal of synchrotron radiation
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Tc L3-edge XANES crystal field splitting radioactive materials technetium oxides
Beschreibung
Zusammenfassung:Tc L3-edge XANES spectra have been collected on powder samples of SrTcO3 (octahedral Tc(4+)) and NH4TcO4 (tetrahedral Tc(7+)) immobilized in an epoxy resin. Features in the Tc L3-edge XANES spectra are compared with the pre-edge feature of the Tc K-edge as well as other 4d transition metal L3-edges. Evidence of crystal field splitting is obvious in the Tc L3-edge, which is sensitive to the coordination number and oxidation state of the Tc cation. The Tc L3 absorption edge energy difference between SrTcO3 (Tc(4+)) and NH4TcO4 (Tc(7+)) shows that the energy shift at the Tc L3-edge is an effective tool for studying changes in the oxidation states of technetium compounds. The Tc L3-edge spectra are compared with those obtained from Mo and Ru oxide standards with various oxidation states and coordination environments. Most importantly, fitting the Tc L3-edge to component peaks can provide direct evidence of crystal field splitting that cannot be obtained from the Tc K-edge
Beschreibung:Date Completed 30.03.2015
Date Revised 25.10.2014
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1600-5775
DOI:10.1107/S1600577514014891