Dissemination of IT for the Promotion of Materials Science (DoITPoMS)

DoITPoMS Micrograph Library Full Record for Micrograph 189
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Full Record for Micrograph 189

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Micrograph no
189
Brief description
Titanate ceramic for immobilising radioactive waste
Keywords
ceramic Link to MATTER Glossary entry for ceramic, hollandite, loveringite, spinel Link to MATTER Glossary entry for spinel, titanate, zirconolite
Categories
Ceramic
System
Oxides + simulated fission products
Composition
Not specified
Standard codes
Reaction
Processing
Ti, Ca, Ba, Fe, Zr, Cr and Ni oxides + simulated fission products. Hot isostatically pressed at 1300ºC to maximise density.
Applications
Under development for immobilising high level radioactive waste. Many active species occupy lattice sites in the crystals.
Sample preparation
Polished but unetched
Technique
Scanning electron microscopy (SEM) in backscattered electron imaging (BEI) mode
Length bar
30 μm
Further information
An assemblage of 5 mixed oxide phases and at least 2 metals. White phases are metals, either austenites (Fe,Ni,Mo,Ru) or silver. Oxide phases are by contrast: light grey is zirconolite (CaZrTi2O7 with some substituted species); mid grey is hollandite (Ba[Fe,Cr,Ti]8O16) with some Cs on Ba site; dark grey is perovskite loveringite (Ca[Ti,Fe,Cr,Zr]21O38) or spinel ([Fe,Ti,Cr]3O4).
Contributor
Dr E Maddrell
Organisation
BNFL plc, Sellafield
Date
02/09/02
Licence for re-use
Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales