Zinc Selenide Window Grade (ZnSe)

Crystallographic

Syngony	Cubic
Symmetry Class	43m
Lattice Constants	a = 5.668 Å

 

Optical

Refractive Index at ne	2.6645
Refractive Index at nF' - nC'	0.1841
Refractive Index at n10.6	2.4034
Refractive Index at n8.0 - n12.5	0.0285
Thermal Coefficient of Refractive Index at 3.39 microns for ±60 °C	(6 ... 6.63) x 10-5
Transmission Range, microns	0.55 - 18

 

Thermal

Thermal Linear Expansion, °C-1 at 27 °C	7.9 x 10-6
Thermal Conductivity, W/(m * °C) at 20 °C	14.1
Specific Heat Capacity, J/(kg * °C)	0.367 x 103
Thermal Stability, °C	57 ±7
Melting Point, °C	1520 ±15

 

Mechanical

Density, g/cm3 at 20 °C	5.26
Mohs Hardness	4
Vickers Microhardness, Pa	(101 ±3) x 107
Young Modulus (E), Pa	7.76 x 1010
Shear Modulus (G), Pa	2.96 x 1010
Poisson Ratio	0.311

 

Chemical

Molecular Weight	144.33
Solubility
in water, gram/100 cm3	insoluble
in acids	soluble

 

Ref. Index vs. Wavelength l

Wavelength, Microns	Refractive Index
1.0	2.4894
2.0	2.4462
3.0	2.4376
4.0	2.4331
5.0	2.4296
6.0	2.4258
7.0	2.4219
8.0	2.4176
9.0	2.4123
10.0	2.4067
11.0	2.4006
12.0	1.3936
12.5	2.3891
15.0	2.3662

 

Internal Transmittance t i (l) vs. Wavelength l

Wavelength, Microns	Internal Transmittance
0.5	0.65
1.0	0.76
3.0	0.94
5.0	0.97
7.0	0.99
8.0	0.99
9.0	0.99
10.0	0.99
12.0	0.98
15.0	0.90
20.0	0.16

Custom sizes and specifications are available on request.