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Meeting MS&T23: Materials Science & Technology
Symposium Emergent Materials Under Extremes and Decisive In Situ Characterizations
Presentation Title In-situ Observations of the High Temperature Melting Behaviour of Ce-brannerite
Author(s) Malin Christian John C J Dixon Wilkins, John McCloy
On-Site Speaker (Planned) Malin Christian John C J Dixon Wilkins
Abstract Scope Titanate brannerites (ATi2O6, A = Ce4+, U4+, Th4+) are candidate wasteform materials for the immobilisation of high actinide content nuclear wastes, either alone, as ceramic phases in glass-ceramic composites, or as one phase in a complex multiphase ceramic. The Ce-endmember (prototypically CeTi2O6) has complex behaviour not seen in the U and Th analogues, including temperature dependent autoreduction balanced by formation of O vacancies, and an anomalously low melting temperature (approximately 1365 C). In this work the melting behaviour of Ce-brannerite and a mechanical mixture of CeO2 + 2TiO2 has been examined using in-situ characterisation methods at high temperature, including: Raman spectroscopy, millimetre wave spectroscopy, and thermal analysis techniques. The cause of the anomalously low melting temperature of this material has been investigated, and its relation to the temperature dependent Ce3+/Ce4+ redox couple examined.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Capturing Laser Induced Dynamics of Materials via Single-Shot Ultrafast Transmission Electron Microscopy
HP-XAFS and Its Application to Topological Insulator Bi2Te3
In-situ Observations of the High Temperature Melting Behaviour of Ce-brannerite
In-situ Raman Studies on Synthesis and Oxidation of UC1-xNx
In-situ/Operando Characterization of Emerging Materials with MeV Ultrafast Electron Diffraction at SLAC National Accelerator Laboratory
In Situ Characterization and Modeling of Spent UO2 Fuel under Ion Irradiation
Irradiation Induced Structural and Thermal Conductivity Changes in Nuclear Fuels
Magnetic Scattering and Spectroscopy at High Pressures at APS and APS-U
Modulation of Structure-function Motifs in Optoelectronic Metal Halides Using High Pressure
Neutron Scattering for Studying Materials Under Extreme Conditions
Perspectives of IXS and NRS Studies in the APSU Era
Polar Magnets in High-Pressure Exotic Perovskites
Pressure-induced Non-monotonic Crossover of Steady Relaxation Dynamics in a Metallic Glass
Pressure Driving Dual-layer Superconductivity in 4Hb-TaSe2 TMD
Structural Manipulation of Ceramic Materials via Extreme Conditions
Will High-entropy Carbides Be Enabling Materials for Extreme Environments?

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