Calgebrasid

Calgebrasid is a synthetic mineral-like solid with a calcium-containing silicate-oxide composition. It has attracted attention for its framework structure and potential functional properties. In scientific literature, Calgebrasid is described as a mixed-cation silicate with variable aluminum and gallium occupancy, allowing tunable properties through cation distribution.

Structure and composition: The material forms a three-dimensional framework built from corner-sharing tetrahedra of silicon and aluminum/gallium, creating interstitial sites that accommodate calcium and other framework cations. The arrangement can yield an open-framework topology with potential ion-conducting pathways, depending on synthesis conditions and specific cation ordering.

Synthesis and stability: Calgebrasid is produced by high-temperature solid-state reactions from calcium oxide, aluminum oxide, gallium oxide, and silicon dioxide, typically followed by extended annealing and slow cooling to promote crystallization. Alternative hydrothermal methods have been reported to yield larger, phase-pure crystals. The stability of the phase is sensitive to temperature, oxygen activity, and the precise Al/Ga distribution.

Properties and potential applications: It exhibits moderate hardness and a low to moderate density, with thermal stability in the mid-range for silicate frameworks. The open-framework structure drives interest in ion transport, making calgebrasid a candidate for solid-state electrolytes and as a support material for heterogeneous catalysis. Ongoing work also explores its optical properties for sensing applications.

Status: Calgebrasid remains a topic of theoretical and experimental study. It has not been observed in natural rock formations, and researchers continue to investigate phase stability, cation distribution, and scalable synthesis routes.