Thermal expansion of ammonium pertechnetate and ammonium perrhenate

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dc.contributor.authorReynolds, EMen_AU
dc.contributor.authorYu, Men_AU
dc.contributor.authorThorogood, GJen_AU
dc.contributor.authorBrand, HEAen_AU
dc.contributor.authorPoineau, Fen_AU
dc.contributor.authorKennedy, BJen_AU
dc.date.accessioned2021-11-12T03:49:29Zen_AU
dc.date.available2021-11-12T03:49:29Zen_AU
dc.date.issued2019-06en_AU
dc.date.statistics2021-11-04en_AU
dc.description.abstractThe thermal expansion of NH4TcO4 and NH4ReO4 between 97 and 500 K has been established using variable temperature synchrotron X-ray diffraction. Both oxides display a tetragonal scheelite-type structure over the temperature range. The observed anomalous thermal expansion is associated with disorder in the orientation of the NH4 groups and the presence of anisotropic, equatorial and axial, interactions between the H atoms and the BO4 tetrahedra. The importance of the hydrogen interactions was verified by a study of the isostructural compound NaReO4 over a similar temperature range. The differences in the details of the Negative Thermal Expansion (NTE) behaviour of NH4TcO4 and NH4ReO4 is a consequence of differences in the H-BO4 interactions due to changes in the B-O bond lengths within the BO4 groups. Both ammonium salts decompose when heated above ∼500 K. ©2019 Elsevier Inc.en_AU
dc.identifier.citationReynolds, E. M., Yu, M., Thorogood, G. J., Brand, H. E. A., Poineau, F. & Kennedy, B. J. (2019). Thermal expansion of ammonium pertechnetate and ammonium perrhenate. Journal of Solid State Chemistry, 274, 64-68. doi:10.1016/j.jssc.2019.01.036en_AU
dc.identifier.issn0022-4596en_AU
dc.identifier.journaltitleJournal of Solid State Chemistryen_AU
dc.identifier.pagination64-68en_AU
dc.identifier.urihttps://doi.org/10.1016/j.jssc.2019.01.036en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12238en_AU
dc.identifier.volume274en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectTechnetium oxidesen_AU
dc.subjectTechnetium compoundsen_AU
dc.subjectCrystal structureen_AU
dc.subjectAmmonium compoundsen_AU
dc.subjectRhenium compoundsen_AU
dc.subjectSodium compoundsen_AU
dc.subjectSaltsen_AU
dc.subjectTungstatesen_AU
dc.subjectPertechnetatesen_AU
dc.titleThermal expansion of ammonium pertechnetate and ammonium perrhenateen_AU
dc.typeJournal Articleen_AU
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