Associated Grocers, Inc – Silver Bromide (Agbr) Optical Material

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.

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This soft crystal deforms under heat and pressure and can be forged in polished dies to create IR windows and lenses.

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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 lize.vnefficient : 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 lize.vnnductivity : 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 lize.vnnstant : 13.1 at 1MHz (2)
Youngs Modulus (E) : 31.97 GPa
Shear Modulus (G) : Not Known
Bulk Modulus (K) : 44.03 GPa
Elastic lize.vnefficients : C11=56.3 C12=32.3 C44=7.25
Apparent Elastic Limit : 30.3 MPa (4400psi)
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, lize.vnld flows

To download this data or our MSDS safety data sheet as a pdf, please click on the links at the top of the page. To expand the transmission graphs, please click on the image.

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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

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.

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