Фторид Бария BaF2

МакроОптика produces lenses, windows, prisms, wedges, ball lenses, cylindrical lenses, windows for spectrophotometers and others optical components according to customers’ specifications and drawings out of crystals barium fluoride BaF2 .

Barium Fluoride is used in spectroscopic components. Barium Fluoride is often suitable for applications in the passive IR band (8 to 14 μm) and is often used as a viewport window for thermography. For an equivalent thickness the transmission extends approximately 1 micron further into the IR than Calcium Fluoride. The highest quality Barium Fluoride also has application as the fastest known scintillator material and is used in High Energy Physics Experiments.

Barium Fluoride is grown by vacuum Stockbarger technique. Unlike CaF2, BaF2 is not found in the native state and all material must be synthesised chemically making BaF2 relatively expensive to produce. Barium Fluoride cleaves easily and is highly susceptible to thermal shock. It polishes well and can be etched. The highest purity Barium Fluoride VUV material can be qualified as fast scintillator grade.

Product Data

Transmission Range  0.15 to 12 Ојm
Refractive Index  1.45 at 5 Ојm (1)
Reflection Loss  6.5% at 5 Ојm (2 surfaces)
Absorption Coefficient  3.2 x 10-4 cm-1 @ 6 Ојm
Reststrahlen Peak  47 Ојm
dn/dT  -15.2 x 10-6/В°C (2)
dn/dОј 0 : 1.95 Ојm
Density  4.89 g/cc
Melting Point  1386В°C
Thermal Conductivity  11.72 W m-1 K-1 @ 286 K
Thermal Expansion  18.1 x 10-6/В°C @ 273 K
Hardness  Knoop 82 with 500g indenter (4)
Specific Heat Capacity  410 J Kg-1 K-1 (3)
Dielectric Constant  7.33 at 1 MHz
Youngs Modulus (E)  53.07 GPa (3)
Shear Modulus (G)  25.4 GPa (3)
Bulk Modulus (K)  56.4 GPa
Elastic Coefficients  C11 = 89.2 C12 = 40.0 C44 = 25.4 (2)
Apparent Elastic Limit  26.9 MPa (300psi) (4)
Poisson Ratio  0.343
Solubility  0.17g/100g water at 23В°C
Molecular Weight  175.36
Class/Structure  Cubic CaF2, Fm3m, (111) cleavage

Transmittance

Refractive Index

No = Ordinary Ray

µm No µm No µm No
0.1408 1.8150 0.1452 1.7820 0.1477 1.7670
0.1500 1.6780 0.2000 1.557 0.2652 1.5122
0.2803 1.5066 0.2893 1.5039 0.2967 1.5019
0.3021 1.5004 0.3130 1.4978 0.3254 1.4952
0.3403 1.4925 0.3466 1.4915 0.3610 1.4894
0.3663 1.4887 0.4046 1.4844 0.5461 1.4759
0.5893 1.4744 0.6438 1.4730 0.6563 1.4727
0.7065 1.4718 0.8521 1.4699 0.8944 1.4694
1.0140 1.4685 1.1287 1.4678 1.3673 1.4667
1.5295 1.4661 1.6810 1.4656 1.7012 1.4655
1.9701 1.4647 2.3254 1.4636 2.6738 1.4623
3.2434 1.4602 3.4220 1.4594 5.1380 1.4501
5.5490 1.44732 6.2380 1.4422 6.6331 1.4390
7.0442 1.4353 7.2680 1.4331 9.7240 1.4051
10.346 1.3936