【摘要】 为了探索模拟Pu⁴⁺在Gd₂Zr₂O₇中实现快速固化的可能性,用CeO₂替代PuO₂,以CeO₂,ZrO₂和Gd₂O₃混合粉体为原料进行了高温高压合成实验,借助XRD衍射图谱、EDS谱和Raman谱研究了材料的微观结构。结果表明:在5.2 GPa的高压和1 873 K的高温条件下,保温保压30 min,成功制备出具有立方烧绿石结构的Gd₂Zr_2-xCe_xO₇化合物。对该合成样品进行SEM电镜扫描观察,形成的晶粒小于30μm。该法可为开展α废物（特别是钚）的固化研究提供参考。更多还原

【Abstract】 In order to investigate the possibility of rapid immobilization for simulated plutonium in Gd₂Zr₂O₇ host phase,synthesis experiments were conducted under high pressure and high temperature using the mixed powders of CeO₂,ZrO₂ and Gd₂O₃ as starting materials,and CeO₂ as a surrogate of PuO₂. With the help of XRD,EDS and Raman analysis,the results indicate that Gd₂Zr_2-xCe_xO₇ with cubic pyrochlore structure was successfully prepared at a pressure of 5.2 GPa and a temperature of 1873 K with 30 min duration time.By means of SEM observation,crystals with grain-size less than 30 am had formed in the as-prepared sample.The rapid and efficient method may provide a novel technical approach for study on the immobilization of a wastes（especially plutonium） in the future.更多还原