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Article Abstract
Rare-earth ions have garnered significant attention due to their large ionic radii and unique electronic configurations. In this study, two scandium-based pyrophosphates, ASc(PO) (A = Ba, Pb), were successfully synthesized by using a high-temperature melting method. They are the first reported examples of divalent cations binding to scandium-based pyrophosphates. The anionic backbones in their structures are all based on Sc-P-O frameworks, and two distinct cluster configurations are observed: cyclic [ScPO] and linear [ScPO] clusters. A comprehensive comparison of Sc/Y-based pyrophosphates reveals a strong correlation between the Sc-P-O configurations and the A-site cationic coordination environments. This work also investigated the influence of cations on the P-O configuration of existing Sc/Y-based pyrophosphates, which also offers useful reference for the synthesis of novel scandium-based phosphates.
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