Radiation damage was simulated in multiphase titanate-based ceramic waste forms using an ion accelerator to generate high energy alpha particles (He+) and an ion implanter to generate 7 MeV gold (Au3+) particles. X-ray diffraction and transmission electron microscopy were used to characterize the damaged surfaces and nearby regions. Simulated multiphase ceramic waste forms were prepared using two processing methods: spark plasma sintering and melt-processing. Both processing methods produced ceramics with similar phase assemblages consisting of hollandite-, zirconolite/pyrochlore-, and perovskite- type phases. The measured heavy ion (Au3+) penetration depth was less in spark plasma sintered samples than in melt-processed samples. Structural breakdown of the hollandite phase occurred under He+ irradiation indicated by the presence of x-ray diffraction peaks belonging to TiO2, BaTiO5, and other hollandite related phases (Ba2Ti9O20). The composition of the constituent hollandite phase affected the extent of damage induced by Au3+ ions.
Revised: January 21, 2021 |
Published: October 1, 2017
Citation
Clark B.C., P. Tumurgoti, S.K. Sundaram, J.M. Amoroso, J.C. Marra, V. Shutthanandan, and M. Tang. 2017.Radiation damage of hollandite in multiphase ceramic waste forms.Journal of Nuclear Materials 494.PNNL-SA-128019.doi:10.1016/j.jnucmat.2017.07.013