Strontium Fluoride (SrF2) is a stable water insoluble brittle white crystalline solid commonly used in oxygen sensitive applications. SrF2 is used in a wide range of modern technological and scientific processes, including etching and oil refining as well as synthetic organic chemistry and the production of pharmaceuticals. SrF2 is a very significant optical material that is utilized in a select few specialized applications as a transparent optical material from vacuum ultraviolet (150 nm) to infrared (11 µm). Alfa Chemistry can use SrF2 material to custom fabricate optical components of virtually any shape and size to customer requirements. If you need help, please contact us.
Advantages and Uses of Strontium Fluoride Materials
SrF2 material, one of the most important alkaline earth fluorides, has many physical properties such as low energy phonons, high ionization, high resistivity coefficient. As a result, it has found widespread application in light emitting devices, optical imaging, biomarkers, anionic conductors, and other applications. SrF2 can transmit infrared radiation (11.1 µm) and ultraviolet rays (150 nm). Its optical characteristics are comparable to those of calcium fluoride and it has a high electrical conductivity. SrF2 is employed as an optical material in a select few specialized applications, such as as a thermoluminescent dosimeter crystal and as an optical coating for lenses.
Fig 1. The transmittance (log scale) of SrF2 films at five selected photon energies. (Marcos L. R, et al. 2013)
SrF2 is almost insoluble in water and has a Ksp value of about 2.0x10-10 at 25 °C. SrF2 has contributed to the research and development of optical materials with its unique material structure and SrF2 has contributed to the research of optical materials and the improvement of optical instruments by its unique material structure and properties.
Applicaitons:
- UV and vacuum UV spectroscopy
- Mid-infrared laser substrate materials
- Manufacturing of optical materials for different devices, such as glasses, windows and lenses
Properties of Thallium Bromo-Iodide Materials
| Density | 4.24 g/cc |
| Molecular Weight | 125.62 |
| Solubility | 0.012g/100g water at 27°C |
| Class/Structure | Cubic Fm3m, Cleaves on (111) |
| Melting Point | 1450°C |
| Hardness | Knoop 154 (100) & 140 (110) |
| Refractive Index | 1.439 at 0.55 μm |
| Transmission Range | 0.15 to 11 μm |
| Reflection Loss | 6.3% at 0.55 μm (2 surfaces) |
| Apparent Elastic Limit | 36.5 MPa (5300 psi) |
| dn/dT | -12x10-6 /°C |
| Youngs Modulus (E) | 89.91 GPa |
| Shear Modulus (G) | 34.6 GPa |
| Bulk Modulus (K) | 24.65 GPa |
| Thermal Expansion | 18.4x10-6 /°C at 293K |
| Thermal Conductivity | 8.3 W/m/K at 293K |
| Dielectric Constant | 7.69 at 2 MHz |
| Specific Heat Capacity | 543 J Kg-1 K-1 |
| Poisson Ratio | 0.25 |
| Elastic Coefficients | C11=124; C12=45; C44=31.7 |
| Absorption Coefficient | <1x10-3 cm-1 at 5 μm |
| Reststrahlen Peak | 46 μm |
About refractive index parameters.
"No" means ordinary light.
| µm | No | µm | No | µm | No | µm | No | µm | No |
|---|---|---|---|---|---|---|---|---|---|
| 0.15 | 1.59400 | 0.61 | 1.43740 | 1.51 | 1.43003 | 6.01 | 1.38934 | 9.10 | 1.32830 |
| 0.20 | 1.50400 | 0.71 | 1.43560 | 2.01 | 1.42761 | 7.01 | 1.37308 | 9.60 | 1.31510 |
| 0.31 | 1.45725 | 0.81 | 1.43435 | 3.01 | 1.42159 | 8.01 | 1.35362 | 10.60 | 1.28540 |
| 0.41 | 1.44556 | 0.91 | 1.43343 | 4.01 | 1.41337 | 8.10 | 1.35170 | 11.10 | 1.26860 |
| 0.51 | 1.44029 | 1.01 | 1.43259 | 5.01 | 1.40269 | 8.60 | 1.34050 |
Reference
- Marcos L. R, et al. (2013). "Optical Constants of SrF2 Thin Films in The 25-780-eV Spectral Range." Journal of Applied Physics. 113: 143501.