| Transmission Range | 0.5 to 40µm |
|---|---|
| Refractive Index | 2.338 at 10µm (1) |
| Reflection Loss | 27.7% at 10µm |
| Absorption Coefficient | n/a |
| Reststrahlen Peak | 172µm |
| dn/dT | n/a |
| dn/dµ | 0 at 8.5µm |
| Density | 7.453 g/cc (1) |
| Melting Point | 460.5 °C (1) |
| Thermal Conductivity | 0.586 W m⁻¹ K⁻¹ at 343K |
| Thermal Expansion | 51 x 10⁻⁶ K⁻¹ at 300K |
| Hardness | Knoop 11.9 with 500g indenter |
| Specific Heat Capacity | 188 J Kg⁻¹ K⁻¹ (3) |
| Dielectric Constant | 30.3 at 1 MHz |
| Young’s Modulus (E) | 29.5 GPa (2) |
| Shear Modulus (G) | 7.58 GPa (2) |
| Bulk Modulus (K) | 22.47 GPa (2) |
| Elastic Coefficients | C11=37.8; C12=14.8; C44=7.56 (2) |
| Apparent Elastic Limit | 20.7 MPa (3000 psi) |
| Poisson Ratio | 0.281 |
| Solubility | 0.05g/100g water at 25°C |
| Molecular Weight | 248.31 |
| Class/Structure | Cubic CsCl, Pm3m, no cleavage (1) |
| µm | No | µm | No | µm | No |
|---|---|---|---|---|---|
| 0.438 | 2.652 | 0.546 | 2.452 | 0.578 | 2.424 |
| 0.650 | 2.384 | 0.750 | 2.350 | 10.00 | 2.338 |
(1) Handbook of Optical Constants, ed Palik, V3, ISBN 0-12-544423-0
(2) Arenberg, Measurements made at Naval Research Labs, USA 1948-49
(3) Kelly, Bureau of Mines Bulletin, No 371, p51. 1934