Abstract
Hollandite ceramics are well-recognized as a promising host for immobilizing radioactive cesium. In the present paper, the [BaxCsy][(Al3+,Ti3+)2x+yTi4+8-2x-y]O16 (0.4 ≤ x, y ≤ 0.8) ceramics were fabricated to investigate the effect of incorporated Cs on structural stability and durability of (Ba,Cs)(Al,Ti)8O16 ceramics with Cs-incorporated. It was found that the sintered samples at 1250 °C show a pure hollandite phase with tetragonal structure (I4/m) and high Cs retention. Moreover, the synthesized (Ba,Cs)(Al,Ti)8O16 ceramics exhibit an excellent aqueous stability and the normalized Cs release rate is 2.82 (± 0.27)×10-3 g m-2 d-1 after 28 days. All these results reveal that (Ba,Cs)(Al,Ti)8O16 is a promising candidate as a Cs-waste form.
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