|
|
|
Syngony
|
Cubic
|
|
Symmetry Class
|
m3m
|
|
Lattice Constants, Angstroms
|
a=4.026 c=a
|
|
Cleavability
|
(100), perfect
|
|
|
|
|
Refractive Index at ne
|
1.3931
|
|
Refractive Index at nF'-nC'
|
0.004
|
|
Thermal Coefficient of Refractive Index at l=3.39 microns,îÑ-1 for +/-60îÑ
|
(-1.25...-1.51)• 10-5
|
|
Transmission Range, microns (thickness 10ìì)
|
0.12¸6.5
|
|
Transmittance ti(l) vs. wavelength l
|
1. in vacuum
2. on an air
|
|
|
|
|
Internal Transmittance ti(l) vs.
wavelength l
|
|
l,ìêì
|
ti(l)
|
|
0.2
|
0.90
|
|
0.5
|
0.98
|
|
1.0
|
0.97
|
|
3.0
|
0.97
|
|
5.0
|
0.88
|
|
6.0
|
0.65
|
|
7.0
|
0.14
|
|
|
|
|
|
|
Refractive Index n vs.
wavelength l
|
|
l,ìêì
|
n(l)
|
|
0.2
|
1.4390
|
|
0.5
|
1.3943
|
|
1.0
|
1.3871
|
|
2.0
|
1.3788
|
|
3.0
|
1.3666
|
|
4.0
|
1.3494
|
|
5.0
|
1.3266
|
|
6.0
|
1.2975
|
|
7.0
|
1.2620
|
|
8.0
|
1.2180
|
|
9.0
|
1.1650
|
|
10.0
|
1.1010
|
|
|
|
|
|
Thermal Linear Expansion at, îÑ-1 for +/-60îÑ
|
(28.1¸34.8)• 10-6
|
|
Thermal Conductivity, W/(m • îÑ) at 26 îÑ
|
14.2
|
|
Specific Heat Capacity, J/(kg • îÑ) at 10 îÑ
|
1561.7
|
|
Melting Point, îÑ
|
870
|
|
|
|
|
Density, g/cm3 at 20 îÑ
|
2.60
|
|
Mohs Hardness
|
4
|
|
Vickers Microhardness , Pa
|
9.8• 108
|
|
Constants of Elastic Compliance, Pa-1
|
S11
|
11.32• 10-12
|
|
S12
|
-3.06• 10-12
|
|
S44
|
15.91• 10-12
|
|
Poisson Ratio
|
0.270
|
|
Young Modulus (Å), Pa
|
<100>
|
8.84• 1010
|
|
<100>
|
14.22• 1010
|
|
Shear Modulus (G), Pa
|
(100)
|
4.09• 1010
|
|
(100)
|
6.29• 1010
|
|
|
|
|
Solubility LiF
|
|
in water at 20 îÑ g/100cm3
|
in acids
|
|
0.27
|
soluble
|
|
"Opto-Technological Laboratory" produces lenses, windows, prisms, wedges and others optical components according to customers’ specifications and drawings out of crystals lithium fluoride ( LiF ) . |
