Thallium Chloride TlCl
Download 
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 = 0
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
Youngs 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 (3000psi)
Poisson Ratio
0.276
Solubility
0.32g/100g water at 20°C
Molecular Weight
239.85
Class/Structure
Cubic CsCl, Pm3m, no cleavage
| µm | No |
|---|---|
| 0.436 | 2.4 |
| 0.546 | 2.27 |
| 0.578 | 2.253 |
| µm | No |
|---|---|
| 0.589 | 2.247 |
| 0.650 | 2.223 |
| 0.750 | 2.198 |
| µm | No |
|---|---|
| 10.0 | 2.193 |
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