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 AMTIR-2

Composition                                           An Arsenic Selenide Glass   As – Se

Glass Transition Temperature                        Tg °C   167  (AMI)

Expansion Coefficient                                    D L / L  = 22.4  x 10^-6 /°C

Softening Point                                                           188 ° C

Thermal Conductivity                                  5.3 x10^-4 cal gm / °C sec

Specific Heat                                                              0.068  

Knoop Hardness                                                         110

Young’s  Modulus  E                                       5.6   x 10⁶ lbs / in²

Shear Modulus   G                                           1.03  x 10⁶ lbs / in²

Poisson's Ratio                                                          0.29

Rupture Modulus                                             ~ 2500  lbs / in²

Tensile Strength                                                1440  lbs / in² 

Compressive Strength                                       8,800 lbs / in² 

Density                                                                 4.66 gm/cm³

Chemical Durability

Chemical                                               Weight Loss (4hrs, gms / in²)

                                           H₂O 25°C - 0, H₂O 90°C - 0, NH₄OH 2%, 60°C-0.01        

                                            KOH, 2%, 60°C- .032, HCL,HNO_3, H₂SO₄ 60°C- O                 

Dielectric Constant                                                        9.1   

Resistivity                                                      15 x 10⁹  ohm-cm                   

          IR REFRACTIVE INDEX OF AMTIR  2

          ( 2008 Sellmeier Fit by Bill Thompson)

  N = [ 1 + l²[ A_o²/ ( l² – A₁ ² ) + A₂²/ ( l² – 19²) + A₃²/( l²- 4xA₁²) ]]^0.5

 A₀ =2.234921 A₁ = 0.24164  A₂ = 0.347441  A₃ = 1.308575  

WL  l      AMI         Abs.Coef.                                                                              

 m m           Results         cm^-1    

1.0             2.9221          0.056

1.064         2.9023          0.040

1.25           2.8638          0.023

1.5             2.8351          0.016

1.75           2.8186          0.015

2.0             2.8082          0.015

3.0             2.7897          0.01

4.0                               2.7830          0.01      V 3 - 5 mm = 176

5.0                               2.7796          0.02

6.0                               2.7773          0.01

7.0                               2.7753          0.01

8.0                               2.7735          0.01

9.0                               2.7714          0.01

10.0                          2.7691          0.01       V  8 – 12  mm = 162

11.0                          2.7662          0.016

12.0           2.7626          0.031

13.0           2.7577          0.22

D N / D T @ 1.5 mm = + 117 x 10^-6 / ° C

D N / D T  @  4 mm  = + 31 x 10 ^–6 / ° C

D N / D T @  10 mm = + 5 x 10^-6 / ° C