Thallium Bromide TlBr
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Transmission Range
0.5 to 40 μm
Refractive Index
2.338 at 10 μm (1)
Reflection Loss
27.7% at 10 μm
Absorption Coefficient
n/a
Reststrahlen Peak
172 μm
dn/dT
n/a
dn/dμ = 0
8.5 μm
Density
7.453 g/cc (1)
Melting Point
460.5°C (1)
Thermal Conductivity
0.586 W m-1 K-1 @ 343 K
Thermal Expansion
51 x 10-6/°C @ 300 K
Hardness
Knoop 11.9 with 500g indenter
Specific Heat Capacity
188 J Kg-1 K-1 (3)
Dielectric Constant
30.3 at 1 MHz
Youngs 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 (3000psi)
Poisson Ratio
0.281
Solubility
0.05g/100g water at 25°C
Molecular Weight
248.31
Class/Structure
Cubic CsCl, Pm3m, no cleavage
| µm | No |
|---|---|
| 0.438 | 2.652 |
| 0.546 | 2.452 |
| 0.587 | 2.424 |
| µm | No |
|---|---|
| 0.650 | 2.384 |
| 0.750 | 2.350 |
| 10.0 | 2.338 |
| µm | No |
|---|---|
Thallium Bromide crystals are grown by sealed-ampoule Stockbarger technique. Thallium salts are toxic, and Thallium Bromide 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
(3) Kelly, Bureau of Mines Bulletin, No 371, p51. 1934