Open AccessHot Isostatically Pressed Zirconolite Wasteforms for Actinide Immobilisation
Author(s) -
Lewis R. Blackburn,
Laura J. Gardner,
ShiKuan Sun,
Ewan R. Maddrell,
Martin C. Stennett,
Claire L. Corkhill,
Neil C. Hyatt
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/818/1/012010
Subject(s) - zirconolite , actinide , hot isostatic pressing , materials science , scanning electron microscope , metallurgy , nuclear chemistry , radiochemistry , phase (matter) , composite material , microstructure , chemistry , pyrochlore , organic chemistry
In order to demonstrate the deployment of Hot Isostatic Pressing (HIP) for the immobilisation of Pu stocks and residues, a series of active and inactive zirconolite formulations have been processed and characterised. In this instance, Ce, U, and Th have been applied as chemical surrogates for Pu 4+ . A range of formulations targeting isovalent Zr 4+ site substitution ( i.e. to simulate CaZr 1-x Pu x Ti 2 O 7 ) have been processed by HIP and characterised by powder X-ray diffraction, and scanning electron microscopy, in order to determine surrogate partitioning between the host zirconolite phase, and accessory phases that may have formed during the HIP process.