Silver Bromide AgBr

Silver Bromide (AgBr) SDS
Silver Bromide (AgBr) Data Sheet

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.

Transmission Range
0.5 to 35 μm  (1)
Refractive Index
2.167 at 10 μm (1) (2)
Reflection Loss
23.9% at 10 μm (2 surfaces)
Absorption Coefficient
Reststrahlen Peak
112.7 μm
dn/dμ = 0
6.473 g/cc
Melting Point
Thermal Conductivity
1.21 W m-1 K-1 @ 273 K
Thermal Expansion
30 x 10-6/°C @ 273 K
Knoop 7
Specific Heat Capacity
292 J Kg-1 K-1
Dielectric Constant
13.1 at 1 MHz (2)
Youngs Modulus (E)
31.97 GPa
Shear Modulus (G)
Bulk Modulus (K)
44.03 GPa
Elastic Coefficients
C11 = 56.3 C12 = 32.3 C44 = 7.25
Apparent Elastic Limit
30.3 MPa (4400psi)
Poisson Ratio
12 x 10-6g/100g water at 20°C
Molecular Weight
Cubic FCC, NaCl, Fm3m, No cleavage, cold flows


µm No
0.391 2.416
0.477 2.33
0.496 2.313
0.55 2.27
µm No
0.60 2.25
0.65 2.24
0.781 2.205
µm No
9.926 2.167
12.66 2.162

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.

(1) Handbook of Optical Constants, ed Palik, V3, ISBN 0-12-544423-0
(2) White; Optical Properties of Silver Bromide. J.Opt.Soc. Am. V62, N2 (1973)

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