Title

Pyrochlore-structured titanate ceramics for immobilisation of actinides: Hot isostatic pressing (HIPing) and stainless steel/waste form interactions

RIS ID

94248

Publication Details

Zhang, Y., Li, H. & Moricca, S. (2008). Pyrochlore-structured titanate ceramics for immobilisation of actinides: Hot isostatic pressing (HIPing) and stainless steel/waste form interactions. Journal of Nuclear Materials, 377 (3), 470-475.

Abstract

A pyrochlore-structured titanate ceramic has been studied in respect of its overall feasibility for immobilisation of impure actinide-rich radioactive wastes through the hot isostatic pressing (HIPing) technique. The resultant waste form contains mainly pyrochlore (∼70%), rutile (∼14%) as well as perovskite (∼12%), hollandite (∼2%) and brannerite (∼1%). Optical spectroscopy confirms that uranium (used to simulate Pu) exists mainly in the stable pyrochlore-structured phase as tetravalent ions as designed. The stainless steel/waste form interactions under HIPing conditions (1280 °C/100 MPa/3 h) do not seem to change the actinide-bearing phases and therefore should have no detrimental effect on the waste form.

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Link to publisher version (DOI)

http://dx.doi.org/10.1016/j.jnucmat.2008.03.022