This paper discusses the synthesis, characterization, and chemical durability assessment of oxyapatite [Ca₂Nd₈(SiO₄)₆O₂] and mixed-alkaline-earth powellite [(Ca,Sr,Ba)MoO₄]. These are the major crystalline phases that precipitate from the melt during cooling of a glass-ceramic waste form currently being evaluated for immobilizing wastes produced during the aqueous reprocessing of used nuclear fuel. The oxyapatite was made at 99.7% purity using a solution-based process followed by heat treatments. The powellite, made by melting carbonates and slow-cooling the melt, formed two different phases, one rich in Ca (74.7%) and Sr (19.4%) (balance is Ba) and the other rich in Sr (25.6%) and Ba (65.6%) (balance is Ca). Following static dissolution tests after 5 days, the oxyapatite phase had a maximum normalized loss of 0.024 g m⁻² for Ca and the powellite phases showed a higher normalized loss from the Ba-powellite (0.22 g m⁻²) compared with the Sr-powellite (0.06 g m⁻²) and Ca-powellite (0.02 g m⁻²). Additionally, crystal structure data were measured using X-ray diffraction and are compared in detail with literature data of powellites and oxyapatites of similar chemistries.

本文讨论了氧磷灰石[Ca ₂ Nd ₈（SiO ₄）₆ O ₂ ]和混合碱土碳纳米管[（Ca，Sr，Ba）MoO ₄的合成，表征和化学耐久性的评估。]。这些是主要的结晶相，在冷却玻璃陶瓷废物形式期间会从熔体中沉淀出来，目前正在评估这些结晶相是否可以固定在用过的核燃料的水后处理过程中产生的废物。使用基于溶液的方法，然后进行热处理，将氧磷灰石制成纯度为99.7％的磷灰石。碳酸盐通过熔融碳酸盐并缓慢冷却熔体而形成，形成两个不同的相，一个相富含Ca（74.7％）和Sr（19.4％）（其余为Ba），另一个富含Sr（25.6％）和Ba （65.6％）（余额为Ca）。经过5天的静态溶出度测试，氧磷灰石相的Ca的最大归一化损失为0.024 g m ^-2，而鲍威尔相的Ba-鲍威尔石的归一化损失更高（0.22 g m ^-2））与Sr钙锰矿（0.06 g m ^-2）和Ca-钙钛矿（0.02 g m ^-2）进行比较。另外，使用X射线衍射测量晶体结构数据，并将其与相似化学的孔雀石和羟磷灰石的文献数据进行详细比较。