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

DOI: 10.1016/j.jnucmat.2017.10.011 DOI Help

Authors: Tzu-yu Chen (University of Birmingham) , Ewan R. Maddrell (National Nuclear Laboratory) , Neil C. Hyatt (The University of Sheffield) , Amy S. Gandy (The University of Sheffield) , Martin C. Stennett (The University of Sheffield) , Joseph A. Hriljac (University of Birmingham)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Nuclear Materials

State: Published (Approved)
Published: October 2017
Diamond Proposal Number(s): 11089

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.

Subject Areas: Environment, Engineering


Instruments: I11-High Resolution Powder Diffraction