Бромид Серебра AgBr

МакроОптика produces mirrors, lenses, windows, prisms, wedges and others optical components according to customers’ specifications and drawings out of crystal silver bromide AgBr.

Silver Bromide is useful material for very deep IR applications where sensitivity to moisture is a problem. Silver Bromide crystal growth was developed relatively recently by the standards of many IR materials. The parameters of Silver Bromide have not been researched as thoroughly as those of Silver Chloride. This soft crystal deforms under heat and pressure and can be forged in polished dies to create IR windows and lenses.

Silver Bromide is grown in small ingots by sealed ampoule Stockbarger techniques. Silver Bromide is malleable and deep yellow, it darkens in sunlight, but less readiliy than Silver Chloride.

Product Data

Transmission Range 0.45 to 35 μm (1)
Refractive Index 2.167 at 10 μm (1)(2)
Reflection Loss 23.9% at 10 μm (2 surfaces)
Absorption Coefficient Not known
Reststrahlen Peak 112.7 μm
dn/dT Not known
dn/dμ = 0 Not known
Density 6.473 g/cc
Melting Point 432 °C
Thermal Conductivity 1.21 W m-1 K-1 at 273 K
Thermal Expansion 30 x 10-6/°C at 273 K
Hardness Knoop 7
Specific Heat Capacity 292 J Kg-1 K-1
Dielectric Constant 13.1 at 1MHz (2)
Youngs Modulus (E) 31.97 GPa
Shear Modulus (G) Not Known
Bulk Modulus (K) 44.03 GPa
Elastic Coefficients C11=56.3 C12=32.3 C44=7.25
Apparent Elastic Limit 26.2 MPa
Poisson Ratio Not Known
Solubility 12 x 10-6g/100g water at 20°C
Molecular Weight 187.78
Class/Structure Cubic FCC, NaCl, Fm3m, No cleavage, cold flows


Refractive Index

No = Ordinary Ray

µm No µm No µm No
0.391 2.416 0.477 2.33 0.496 2.313
0.55 2.27 0.6 2.25 0.65 2.24
0.781 2.205 9.926 2.167 12.66 2.162