Potassium hexafluorosilicate (K₂SiF₆) is an inorganic ceramic compound belonging to the fluoride salt family, characterized by its ionic crystal structure. It is primarily used as a raw material in aluminum refining (cryolite substitute), optical coatings, and specialty glass applications where fluoride-based ceramics offer chemical stability and transparency. Engineers select K₂SiF₆ for its resistance to corrosion in molten metal processing and its role in producing low-refractive-index optical films, though its hygroscopic nature and toxicity handling requirements limit broader adoption compared to safer alternatives in consumer-facing applications.
Compliance & Regulations
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Bulk Modulus(K) | 28.00 | GPa | — | ||
Poisson's Ratio(ν) | 0.3100 | - | — | ||
Shear Modulus(G) | 12.48 | GPa | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 2.829 | kg/m³ | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Band Gap(Eg) | 7.887 | eV | — | ||
Dielectric Constant (Relative Permittivity)(εr)3 entries | 5.950 | - | — | ||
| ↳ | 4.727 | - | — | ||
| ↳ | 3.968 range 1.912–6.025median of 2 measurements | - | — | ||
Electronic Dielectric Tensor(ε∞) | Matrix (redacted) | - | — | ||
Total Dielectric Tensor(ε) | Matrix (redacted) | - | — | ||
Magnetic Moment(μB) | 0.000 | µB | — | ||
Piezoelectric Modulus(eij) | 0.000 | C/m² | — | ||
Seebeck Coefficient(S) | -151.1 | µV/K | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Energy Above Hull(ΔEhull) | 0.000 | eV/atom | — | ||
Formation Energy(ΔHf) | -3.287 | eV/atom | — |