Abstract
Mixtures of cesium nitrate and ammonium-ion type zirconium phosphate, NH4Zr2(PO4)3, with varying molar ratios were thermally treated at 600 or 750 °C, yielding partial cesium-ion type zirconium phosphates, CsxH1−xZr2(PO4)3 (x = 0.4, 0.6, 0.8). Immobilization of cesium on the CsxH1−xZr2(PO4)3 was examined. Leaching tests at 90 °C using pseudo-seawater as leachant revealed that the cesium leach rates of the materials with x = 0.4 and 0.6 were in the order of 10−2 g m−2 day−1, smaller than those reported for borosilicate glasses, the generally accepted first-generation waste form. This indicated the materials examined were better cesium immobilizers than borosilicate glasses.
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