Structures and phase transitions in pertechnetates

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dc.contributor.authorKennedy, BJen_AU
dc.contributor.authorInjac, Sen_AU
dc.contributor.authorThorogood, GJen_AU
dc.contributor.authorBrand, HEAen_AU
dc.contributor.authorPoineau, Fen_AU
dc.date.accessioned2021-11-12T03:48:11Zen_AU
dc.date.available2021-11-12T03:48:11Zen_AU
dc.date.issued2019-07-07en_AU
dc.description.abstractThe temperature dependence of the structures of four pertechnetates (ATcO4A = Ag, Tl, Rb, Cs) from 90 K to their melting points is described. Synchrotron X-ray diffraction measurements show that RbTcO4 undergoes a I41/a to I41/amd transition near 530 K that is associated with a change in the orientation of the TcO4– tetrahedra about the scheelite b axis. AgTcO4 also exhibits a tetragonal scheelite type structure, and this is retained between 90 and 750 K, above which it melted. CsTcO4 has an orthorhombic pseudo-scheelite structure at room temperature and this undergoes a first-order orthorhombic to tetragonal transformation (Pnma to I41/a) near 430 K. TlTcO4 is isostructural with CsTcO4 at 90 K, but the orthorhombic to tetragonal transformation proceeds via an intermediate orthorhombic phase. The different behavior found here and described previously for the analogous Re oxide TlReO4 highlights the differences in the chemistry of these two systems. © 2019 American Chemical Societyen_AU
dc.identifier.citationKennedy, B. J., Injac, S., Thorogood, G. J., Brand, H. E. A., & Poineau, F. (2019). Structures and phase transitions in pertechnetates. Inorganic chemistry, 58(15), 10119-10128. doi:10.1021/acs.inorgchem.9b01257en_AU
dc.identifier.issn0020-1669en_AU
dc.identifier.issue15en_AU
dc.identifier.journaltitleInorganic chemistryen_AU
dc.identifier.pagination10119-10128en_AU
dc.identifier.urihttps://doi.org/10.1021/acs.inorgchem.9b01257en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12237en_AU
dc.identifier.volume58en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectThermal expansionen_AU
dc.subjectPhase transformationsen_AU
dc.subjectCationsen_AU
dc.subjectZirconen_AU
dc.subjectMonazitesen_AU
dc.subjectTechnetium compoundsen_AU
dc.subjectPertechnetatesen_AU
dc.titleStructures and phase transitions in pertechnetatesen_AU
dc.typeJournal Articleen_AU
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