K9Y3[Si12O32]F2

Area of Science:

• Inorganic Chemistry
• Solid-State Chemistry
• Crystallography

Background:

• Silicate structures are fundamental in materials science.
• Understanding novel silicate frameworks aids in developing new materials with tailored properties.

Purpose of the Study:

• To synthesize and characterize single crystals of nona-potassium triyttrium dodeca-silicate difluoride.
• To elucidate the detailed crystal structure and bonding of this new silicate compound.

Main Methods:

• Flux synthesis using SiO2-Y2O3-KF system.
• Single-crystal X-ray diffraction analysis.

Main Results:

• The compound crystallizes as a single-layer silicate with sheets parallel to (110).
• Silicate layers contain secondary (Q(2)) and tertiary (Q(3)) tetrahedra in a 1:2 ratio, forming six-, eight-, and twelve-membered rings.
• Yttrium cations link layers via distorted octahedral coordination, with charge balance achieved by F(-) and K(+) in structural channels.

Conclusions:

• A novel silicate structure, nona-potassium triyttrium dodeca-silicate difluoride, has been successfully synthesized and characterized.
• The intricate arrangement of silicate tetrahedra, Yttrium coordination, and charge-compensating ions provides insights into silicate framework construction.