Transformation of Cs-IONSIV® into a ceramic wasteform by hot isostatic pressing

CHEN, Tzu-Yu, MADDRELL, Ewan R., HYATT, Neil C., GANDY, Amy S., STENNETT, Martin C. and HRILJAC, Joseph A. (2017). Transformation of Cs-IONSIV® into a ceramic wasteform by hot isostatic pressing. Journal of Nuclear Materials, 498, 33 - 43.

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Abstract

A simple method to directly convert Cs-exchanged IONSIV® IE-911 into a ceramic wasteform by hot isostatic pressing (1100 °C/190 MPa/2 hr) is presented. Two major Cs-containing phases, Cs2TiNb6O18 and Cs2ZrSi6O15, and a series of mixed oxides form. The microstructure and phase assemblage of the samples as a function of Cs content were examined using XRD, XRF, SEM and TEM/EDX. The chemical aqueous durability of the materials was investigated using the MCC-1 and PCT-B standard test methods. For HIPed Cs-IONSIV® samples, the MCC-1 normalised release rates of Cs were <1.57 × 10−1 g m−2 d−1 at 0–28 days, and <3.78 × 10−2 g m−2 d−1 for PCT-B at 7 days. The low rates are indicative of a safe long-term immobilisation matrix for Cs formed directly from spent IONSIV®. It was also demonstrated that the phase formation can be altered by adding Ti metal due to a controlled redox environment.

Item Type:	Article
Identification Number:	https://doi.org/10.1016/j.jnucmat.2017.10.011
Page Range:	33 - 43
Depositing User:	Tzu-Yu Chen
Date Deposited:	21 Jun 2018 08:39
Last Modified:	18 Mar 2021 01:23
URI:	https://shura.shu.ac.uk/id/eprint/21637

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