Property

AMTIR-1

AMTIR-2

AMTIR-3

AMTIR-4

AMTIR-5

AMTIR-6

C1

Composition

Ge-As-Se

As-Se

Ge-Sb-Se

As-Se

As-Se

As-S

As-Se-Te

Transmission Range µm

0.7-12

1.0-14

1.0-12

1.0-12

1.0-12

0.6-8

1.2-14

Ref Index @ 10µm

2.4981

2.7613

2.6027

2.6431

2.7398

2.3807

2.8051

ΔN/ΔT°C x 10-6@ 10µm 

+72

+5

+91

-23

<1(5µm)

<1

31

Knoop Hardness

170

110

150

84

87

109

110

Therm Exp x 10-6 / °C

12

22.4

14

27

23.7

21.6

23

Thermal Condx  (cal/gm sec°C) 10-4

6

5.3

5.3

5.3

5.7

4

5.2

Specific Heat (cal/gm°C)

0.072

0.086

0.066

0.086

0.066

0.109

0.062

Density gm/cm3

4.4

4.66

4.67

4.49

4.51

3.2

4.69

Rupture Mod (psi)

2700

2500

2500

2358

2400

2400

2500

Young's Mod (x106 psi)

3.2

5.6

3.1

2.2

2.56

2.3

1.8

Shear Mod (x106 psi)

1.3

1.03

1.2

0.85

1.01

0.94

1.03

Poisson's Ratio

0.27

0.29

0.26

0.297

0.279

0.24

0.29

Softening Point °C

405

188

295

131

170

210

154

Glass Trans Temp (Tg°C)

368

167

278

103

143

187

133

Upper Use Temp °C Dispersion Values

300

150

250

90

130

150

120

3 - 5 µm

202

171

159

186

175

155

148

8 - 12 µm

109

149

110

235

172

196