|
|
|
Syngony
|
Tetragonal
|
|
Symmetry Class
|
4/mmm
|
|
Lattice Constants, Angstroms
|
a=4.64 c=3.06
|
|
Cleavability
|
(100),(110), imperfect
|
|
|
|
|
Refractive Index at ne
|
no
|
1.3786
|
|
ne
|
1.3904
|
|
Refractive Index, nF'-nC'
|
no
|
0.0034
|
|
ne
|
0.0110
|
|
Thermal Coefficient of Refractive Index at l=3.39 microns, îÑ-1
for +/-60îÑ
|
bo
|
(0.15¸0.10)• 10-5
|
|
be
|
(0.10¸0.04)• 10-5
|
|
Transmission Range, microns (thickness 10ìì)
|
0.13 ¸7.0
|
|
Transmittance ti(l) vs. wavelength l
|
MgF2
|
|
|
|
|
|
Internal Transmittance ti(l) vs.
wavelength l
MgF2
Magnesium Fluoride
|
|
l,ìêì
|
ti(l)
|
|
0.2
|
0.95
|
|
0.5
|
0.97
|
|
1.0
|
0.97
|
|
3.0
|
0.97
|
|
5.0
|
0.97
|
|
6.0
|
0.91
|
|
7.0
|
0.54
|
|
8.0
|
0.12
|
|
|
|
|
|
|
|
|
|
Refractive Index n vs.
wavelength l
|
|
l,ìêì
|
no/ne
|
|
0.2
|
1.4231
1.4376
|
|
0.5
|
1.3797
1.3916
|
|
1.0
|
1.3736
1.3852
|
|
2.0
|
1.3686
1.3797
|
|
3.0
|
1.3618
1.3724
|
|
4.0
|
1.3525
1.3622
|
|
5.0
|
1.3400
1.3487
|
|
6.0
|
1.3242
1.3315
|
|
7.0
|
1.3044
1.3101
|
|
|
|
Thermal MgF2 ( Magnesium Fluoride )
|
|
Thermal Linear Expansion at, îÑ-1 for +/-60îÑ
|
^to c-axis
|
(6.23¸9.25)• 10-6
|
|
// to c-axis
|
(10.86¸14.54)• 10-6
|
|
Specific Heat Capacity, J/(kg • îÑ) at 18 îÑ
|
920.0
|
|
Melting Point, îÑ
|
1255
|
|
|
|
|
Density, g/cm3 at 20 îÑ
|
3.18
|
|
Mohs Hardness
|
6
|
|
Vickers Microhardness , Pa
|
^to c-axis
|
289• 107
|
|
|| to c-axis
|
441• 107
|
|
Constants of Elastic Compliance, Pa-1
|
S11
|
12.45• 10-12
|
|
S12
|
-7.16• 10-12
|
|
S13
|
-1.66• 10-12
|
|
S33
|
5.94• 10-12
|
|
S44
|
17.54• 10-12
|
|
S66
|
10.53• 10-12
|
|
Poisson Ratio
|
|| to c-axis
|
0.577
|
|
Young Modulus (Å), Pa
|
|| to c-axis
|
16.91• 1010
|
|
^to c-axis
|
7.97• 1010
|
|
Shear Modulus (G), Pa
|
|| to c-axis
|
5.71• 1010
|
|
^to c-axis
|
9.52• 1010
|
|
|
|
|
Solubility
|
|
in water at 18 îÑg/100cm3
|
in acids
|
|
0.0076
|
soluble
|
|
"Opto-Technological Laboratory" produces lenses, windows, prisms, wedges, cylindrical lenses and others optical components according to customers’ specifications and drawings out of crystals magnesium fluoride ( MgF2 ) . |
