Ab initio structure determinations of high-performance radioactive waste forms
-
Altmetric Citations
Carter, Melody; Wallwork, Kia; James, Michael; Withers, Raymond
Description
Immobilisation of high-level radioactive wastes in stable matrices for long-term storage or geological disposal is a key step in closing the nuclear fuel cycle. Titanate minerals have shown much promise in their capacity to take up radioactive elements into their crystal structures at regular lattice sites in pyrochlore and brannerite phases. Previously unreported uranyl titanates BaUTiO6 and Na2U3Ti2O11 have been synthesised under argon at 1400 and 1250 °C, respectively and their structures...[Show more]
dc.contributor.author | Carter, Melody | |
---|---|---|
dc.contributor.author | Wallwork, Kia | |
dc.contributor.author | James, Michael | |
dc.contributor.author | Withers, Raymond | |
dc.date.accessioned | 2015-12-07T22:20:36Z | |
dc.identifier.issn | 0921-4526 | |
dc.identifier.uri | http://hdl.handle.net/1885/19667 | |
dc.description.abstract | Immobilisation of high-level radioactive wastes in stable matrices for long-term storage or geological disposal is a key step in closing the nuclear fuel cycle. Titanate minerals have shown much promise in their capacity to take up radioactive elements into their crystal structures at regular lattice sites in pyrochlore and brannerite phases. Previously unreported uranyl titanates BaUTiO6 and Na2U3Ti2O11 have been synthesised under argon at 1400 and 1250 °C, respectively and their structures determined by ab initio techniques using a combination of electron, synchrotron and neutron powder diffraction. BaUTiO6 crystallises with a carnotite-type structure (P21/c; a=6.4463(1) Å, b=8.5999(1) Å, c=10.2532(1) Å; >=75.936(1)° and V=551.36(1) Å3); while Na2U3Ti2O11 forms an orthorhombic structure (Pnma; a=31.0421(8) Å, b=7.2774(2) Å, c=7.6111(2) Å and V=1719.4(1) Å3). Due to their potential value as a radioactive waste forms, the leach rates of uranium, barium and sodium were determined. Normalised uranium leach rates from BaUTiO6 and Na2U3Ti2O11, averaged over 7 days were orders of magnitude less than those for brannerite and for U-containing pyrochlore waste forms. Crown | |
dc.publisher | Elsevier | |
dc.source | Physica B | |
dc.subject | Keywords: Cell immobilization; Crystal structure; Electron diffraction; Neutron diffraction; Nuclear fuels; Titanate minerals; Ab initio techniques; Neutron powder diffraction; Synchrotron diffraction; Radioactive wastes Electron diffraction; Neutron powder diffraction; Synchrotron diffraction; Titanate minerals | |
dc.title | Ab initio structure determinations of high-performance radioactive waste forms | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 385-386 | |
dc.date.issued | 2006 | |
local.identifier.absfor | 091201 - Ceramics | |
local.identifier.absfor | 030206 - Solid State Chemistry | |
local.identifier.ariespublication | u4217927xPUB9 | |
local.type.status | Published Version | |
local.contributor.affiliation | Carter, Melody, Australian Nuclear Science and Technology Organisation | |
local.contributor.affiliation | Wallwork, Kia, Australian Synchrotron | |
local.contributor.affiliation | James, Michael, Australian Nuclear Science and Technology Organisation | |
local.contributor.affiliation | Withers, Raymond, College of Physical and Mathematical Sciences, ANU | |
local.description.embargo | 2037-12-31 | |
local.bibliographicCitation.issue | Part 1 | |
local.bibliographicCitation.startpage | 535 | |
local.bibliographicCitation.lastpage | 537 | |
local.identifier.doi | 10.1016/j.physb.2006.05.273 | |
dc.date.updated | 2015-12-07T08:47:56Z | |
local.identifier.scopusID | 2-s2.0-33751332785 | |
Collections | ANU Research Publications |
Download
File | Description | Size | Format | Image |
---|---|---|---|---|
01_Carter_Ab_initio_structure_2006.pdf | 276.96 kB | Adobe PDF | Request a copy |
Items in Open Research are protected by copyright, with all rights reserved, unless otherwise indicated.
Updated: 17 November 2022/ Responsible Officer: University Librarian/ Page Contact: Library Systems & Web Coordinator