Oxygen deficient lead-technetium pyrochlore, the first example of a stable valence V technetium oxide?

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dc.contributor.authorThorogood, GJen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorCarter, MLen_AU
dc.contributor.authorLosurdo, Len_AU
dc.contributor.authorSaura-Múzquiz, Men_AU
dc.contributor.authorThorogood, KJen_AU
dc.contributor.authorTing, Jen_AU
dc.contributor.authorWallwork, KSen_AU
dc.contributor.authorZhang, Zen_AU
dc.contributor.authorKennedy, BJen_AU
dc.date.accessioned2022-04-08T05:43:34Zen_AU
dc.date.available2022-04-08T05:43:34Zen_AU
dc.date.issued2021-07-05en_AU
dc.date.statistics2022-03-24en_AU
dc.description.abstractDespite the fact that Technetium V oxides are possible there are very few reports of their existence. Most recently Lawler et.al. [1] have reported the structure of Tc2O5 “tech red” and have noted that it is indeed volatile. It is apparent from this study that there is no stable form and they draw parallels with a well-studied analogue of Tc2O5, Re2O5 that disprortioniates into Re(4+) and Re(7+) species. Given these parallels we investigated PbTcO3 as reported by Muller et.al [2] to be a pyrochlore in an attempt to determine if there were parallels with Pb2Re2O7-d. 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 Pb2Tc2O6.86. The displacive disorder of the Pb cations is evident from the refinements as has been observed Bi2Tc2O7-d. X-ray absorption 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 local coordination of the Technetium leading us to conclude that this pyrochlore is the first example of a stable valence V Technetium oxide. [1] Lawler, K. V. et al. Unraveling the mystery of ‘tech red’-a volatile technetium oxide. Chem. Commun. 54, 1261–1264 (2018). [2] Muller, O., White, W. B. & Roy, R. Crystal chemistry of some technetium-containing oxides. J. Inorg. Nucl. Chem. 26, 2075–2086 (1964).en_AU
dc.identifier.citationThorogood, G. J., Avdeev, M., Carter, M., Losurdo, L., Muzquiz, M. S., Thorogood, K., Ting, J., Wallwork, K. S. Zhang, Z. & Kennedy, B. (2021). Oxygen deficient lead-technetium pyrochlore, the first example of a stable valence V technetium oxide? Paper presented at Goldschmidt 2021 Virtual, 4-9 July 2021. Retrieved from: https://2021.goldschmidt.info/goldschmidt/2021/meetingapp.cgi/Paper/4573en_AU
dc.identifier.conferenceenddate9 July 2021en_AU
dc.identifier.conferencenameGoldschmidt 2021en_AU
dc.identifier.conferenceplaceVirtualen_AU
dc.identifier.conferencestartdate4 July 2021en_AU
dc.identifier.urihttps://2021.goldschmidt.info/goldschmidt/2021/meetingapp.cgi/Paper/4573en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12978en_AU
dc.language.isoenen_AU
dc.publisherEuropean Association of Geochemistry and the Geochemical Society (Goldschmidt)en_AU
dc.subjectTechnetium oxidesen_AU
dc.subjectTechnetium compoundsen_AU
dc.subjectTechnetiumen_AU
dc.subjectLeaden_AU
dc.subjectOxygenen_AU
dc.subjectPyrochloreen_AU
dc.subjectValenceen_AU
dc.titleOxygen deficient lead-technetium pyrochlore, the first example of a stable valence V technetium oxide?en_AU
dc.typeConference Presentationen_AU
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