Silver Bromide (AgBr) Optical Material
Silver bromide is a non-glass, inorganic optical material. It has a fairly high density among non-glass optical ceramics. In addition, it has a fairly low melting temperature and a moderately low thermal conductivity. The graph bars on the material properties cards below compare silver bromide to other non-glass optical ceramics (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Thermal Properties
Melting Onset (Solidus)
430 °C 810 °F
Specific Heat Capacity
290 J/kg-K 0.069 BTU/lb-°F
Thermal Conductivity
1.2 W/m-K 0.69 BTU/h-ft-°F
Thermal Expansion
30 µm/m-K
Other Material Properties
Density
6.5 g/cm3 400 lb/ft3
Dielectric Constant (Relative Permittivity) At 1 MHz
13
Elastic (Young's, Tensile) Modulus
32 GPa 4.6 x 106 psi
Light Transmission Range
0.45 to 35 µm
Refractive Index
2.3
Common Calculations
Stiffness to Weight: Axial
2.7 points
Stiffness to Weight: Bending
16 points
Thermal Diffusivity
0.64 mm2/s
Followup Questions
Further Reading
Handbook of Optical Materials, Marvin J. Weber, 2003
Handbook of Optical Constants of Solids, Edward D. Palik (editor), 1998