Tuning the Anionic Configuration in ASc₂(P₂O₇)₂ (A = Ba, Pb) through A-Site Cationic Coordination Engineering

Area of Science:

• Inorganic Chemistry
• Materials Science
• Solid-State Chemistry

Background:

• Rare-earth ions are crucial in materials science due to their unique properties.
• Scandium-based pyrophosphates are an emerging class of materials with potential applications.
• Understanding structure-property relationships is key for designing new functional materials.

Purpose of the Study:

• To synthesize novel scandium-based pyrophosphates incorporating divalent cations.
• To characterize the crystal structures and identify unique Sc-P-O frameworks.
• To investigate the influence of cations on the structural configurations of scandium/yttrium pyrophosphates.

Main Methods:

• High-temperature melting method for synthesis.
• Single-crystal and powder X-ray diffraction for structural analysis.
• Comparative analysis of scandium and yttrium pyrophosphate structures.

Main Results:

• Successful synthesis of two new divalent cation-containing scandium pyrophosphates: BaSc2(P2O7)2 and PbSc2(P2O7)2.
• Discovery of two distinct Sc-P-O anionic backbone configurations: cyclic [ScP2O10] and linear [ScP2O11] clusters.
• Established a correlation between Sc-P-O configurations and A-site cation coordination environments.

Conclusions:

• The study reports the first divalent cations in scandium-based pyrophosphates.
• Structural diversity in Sc-P-O frameworks is influenced by the A-site cation.
• Findings provide a basis for the rational design and synthesis of new scandium phosphate materials.