A2B2O7 pyrochlore oxides are being considered as potential host materials for the immobilization of fission products. It is therefore important to establish the relative ability of these compounds to accommodate fission product ions. We address this issue by using computer simulations to predict the structures and relative equilibrium energies associated with solution of Sr2+ over an extensive compositional range. Results indicate that strontium is accommodated via substitution for A host cations with oxygen vacancy compensation. This results in a nonstoichiometric composition. Optimum compositions and defect clusters structures are identified by constructing contour energy maps.
A2B2O7 烧绿石氧化物被认为是固定裂变产物的潜在宿主材料。因此,确定这些化合物容纳裂变产物离子的相对能力非常重要。为了解决这个问题,我们使用计算机模拟来预测与 Sr2+ 溶液相关的结构和相对平衡能量,其组成范围很广。结果表明,锶是通过氧空位补偿来替代 A 主阳离子的。这导致了一种非化学计量成分。通过构建等值线能量图,确定了最佳成分和缺陷簇结构。