Uranyl phosphate synthesis (MUO2PO4, M = Na+, K+, NH4+) by diffusion method, direct and pH-controlled precipitation has been performed and compared. Chemical and thermogravimetric analysis revealed compound stoichiometry to be in good agreement with ideal mineral phases (sodium uranyl phosphate (NaUO2PO4⋅xH2O), meta-ankoleite (KUO2PO4⋅3H2O) and uramphite ((NH4)UO2PO4⋅3H2O)) except for sodium and ammonium cations. Layered platelet-type crystal structures associated with uranyl phosphates were confirmed. Some long-range crystal structure was observed under direct precipitation conditions. No visible evidence of long-range crystal structures for samples formed during pH-controlled precipitation was found due to dilute formation conditions and rapid nucleation kinetics.

中文翻译：

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用于铀螯合的磷酸铀酰 (MUO2PO4, M = Na+, K+, NH4+) 沉淀：形成和物理化学表征

通过扩散法、直接和 pH 控制沉淀法合成磷酸铀酰 (MUO2PO4, M = Na+, K+, NH4+) 已进行并比较。化学和热重分析表明，除钠和铵外，化合物的化学计量与理想的矿物相（磷酸铀酰钠 (NaUO2PO4⋅xH2O)、偏铁镁石 (KUO2PO4⋅3H2O) 和 uramphite ((NH4)UO2PO4⋅3H2O)）非常吻合阳离子。证实了与磷酸铀酰相关的层状片状晶体结构。在直接沉淀条件下观察到一些长程晶体结构。由于稀薄的形成条件和快速的成核动力学，没有发现样品在 pH 控制沉淀过程中形成的长程晶体结构的可见证据。