Abstract
Gd2Zr2O7 ceramic is recognized as an ideal matrice for the immobilization of high-level radioactive waste. In this report, the single Gd2Zr2O7 nanograin ceramic was rapidly synthesized by self-propagating chemical furnace synthesis plus quick pressing (SCF/QP) using Gd2O3 and ZrO2 with nano-scale particle size as the raw materials. The results demonstrate Gd2Zr2O7 nanograin ceramic with an average grain size of 84 nm was successfully obtained under the ultra-high heating rate. The Gd2Zr2O7 ceramic shows reasonable high Vickers hardness of 11.4 GPa and bulk density of 6.54 g/cm3. The aqueous durability was also evaluated. The LRGd and LRZr values of Gd2Zr2O7 sample were as low as 5.4 × 10−6 and 8.2 × 10−7 g m−2 d−1 after 42 days leaching.
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