Abstract
[CsxBay][(Al3+,Ti3+)2y+xTi4+8-2y-x]O16 (0.4 ≤ x, y ≤ 0.8) ceramics were synthesized to investigate the substitution effects of Ba2+ for Cs+ on the stability of hollandite-ceramic waste forms. It was found that the substitution of Ba2+ for Cs+ in the (Cs,Ba)-hollandite system does not cause substantial variation in the crystallographic phase and microstructure. The normalized release rates of Cs and Ba at 90 °C in deionized water were < 0.005 g m−2 d−1 after 28 days. These results indicate that hollandite ceramics are an ideal host for permanent radioactive caesium disposal.
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