| Transmission Range | 0.5 to 30 μm |
| Refractive Index | 2.193 at 10 μm (1) |
| Reflection Loss | 24.5% at 10 μm (2 surfaces) |
| Absorption Coefficient | n/a |
| Reststrahlen Peak | 131 μm |
| dn/dT | n/a |
| dn/dμ | 3.5 μm |
| Density | 7.01 g/cc (1) |
| Melting Point | 430.2°C (1) |
| Thermal Conductivity | 0.75 W m-1 K-1 @ 311 K |
| Thermal Expansion | 53 x 10-6/°C @ 300 K |
| Hardness | Knoop 12.8 with 500g indenter (4) |
| Specific Heat Capacity | 218 J Kg-1 K-1 |
| Dielectric Constant | 31.9 at 1 MHz |
| Young's Modulus (E) | 31.71 GPa (2) |
| Shear Modulus (G) | 7.58 GPa (2) |
| Bulk Modulus (K) | 23.57 GPa (2) |
| Elastic Coefficients | C11 = 40.1; C12 = 15.3; C44 = 7.6 (2) |
| Apparent Elastic Limit | 20.7 MPa (3000 psi) |
| Poisson Ratio | 0.276 |
| Solubility | 0.32 g/100 g water at 20°C |
| Molecular Weight | 239.85 |
| Class/Structure | Cubic CsCl, Pm3m, no cleavage |
| μm | No1 | μm | No2 | μm | No3 |
|---|---|---|---|---|---|
| 0.436 | 2.400 | 0.589 | 2.247 | 10.0 | 2.193 |
| 0.546 | 2.270 | 0.650 | 2.223 | ||
| 0.578 | 2.253 | 0.750 | 2.198 |
Thallium Chloride crystals are grown by sealed-ampoule Stockbarger technique. Thallium salts are toxic, and Thallium Chloride has enough solubility to require extreme caution. Careful handling with plastic gloves covered with soft cotton gloves as appropriate to delicate optics is required
REFERENCES:
(1) Handbook of Optical Constants, ed Palik, V3, ISBN 0-12-544423-0
(2) Arenberg, Measurements made at Naval Research Labs, USA 1948-49