K3Ga2(PO4)3 and Na3Ga(PO4)2

Area of Science:

• Inorganic Chemistry
• Solid-State Chemistry
• Crystallography

Background:

• Alkali metal phosphates are crucial in materials science.
• Gallium-containing phosphates exhibit diverse structural properties.
• Understanding ion transport pathways is key for developing new materials.

Purpose of the Study:

• To elucidate the crystal structures of tripotassium digallium tris(phosphate) and trisodium gallium bis(phosphate).
• To investigate the nature of alkali ion channels within these structures.
• To analyze the coordination environments of gallium and phosphate groups.

Main Methods:

• Single-crystal X-ray diffraction was used to determine the crystal structures.
• Analysis of coordination polyhedra and network topology.
• Identification and characterization of ion-conducting pathways.

Main Results:

• Tripotassium digallium tris(phosphate) crystallizes in an orthorhombic system with 1D alkali ion channels along the a axis.
• Trisodium gallium bis(phosphate) adopts a triclinic structure, also featuring 1D alkali ion channels along the a axis.
• The anionic frameworks involve vortex-linked phosphate tetrahedra and gallium in tetrahedral or trigonal bipyramidal coordination.

Conclusions:

• The studied gallium phosphates possess distinct structural architectures.
• Irregular 1D alkali ion channels are a key feature, influencing potential ion mobility.
• The coordination diversity of gallium impacts the overall framework and channel characteristics.