| BaF2 is relatively hard but is highly sensitive
to thermal shock. For its transmission range is 0.2 ¦Ìm - 11 ¦Ìm, the material
is widely used for making optical windows, lenses and prisms in UV-IR
spectra. Besides it can also be used as substrate for some applications.
BaF2 is less resistant to attack by water than CaF2.
Pronounced water attack occurs at 500 ¡ãC, but in a dry environment the
material can be used up to 800 ¡ãC. BaF2 is grown by modified
Bridgman technique. Maximum available size: Dia 200 mm x Thickness 50
mm. In addition, BaF2 is usually used as scintillator for
gamma detection. It is the fastest scintillating crystals up to now.
Main Specifications:
| Maximum Size |
Single Crystal: ¦Õ100¡Á100
mm
Poly Crystal: ¦Õ200¡Á100 mm (3 ~7 boundaries) |
| Dimension Tolerance |
¡À0.1mm |
| Flatness Tolerance |
¦Ë~ ¦Ë/10 at 632.8 nm over central
90% of edge dimensional |
| Parallelism |
¡À1 arc sec ~ ¡À3 arc min |
| Surface Quality (Scratch/Dig) |
10/5 |
Physical and Optical Properties:
| Transmission Range (mm) |
0.15
~12.5 |
| Refractive Index (within 0.26~12.00 mm) |
1.5122~1.3703 |
| Reflection Loss at 10.35 mm |
5.3% (2 surfaces) |
| Absorption Coefficient at 6mm (cm-1) |
3.2¡Á10-4 |
| Density (g/cm3) |
4.89 |
| Melting Point (¡ãC) |
<1280 |
| Thermal Conductivity at 286K (Wm-1K-1) |
11.72 |
| Thermal Expansion at 273K (K-1) |
18.1¡Á10-6 |
| Knoop Hardness |
82 with 500g indenter |
| Specific Heat (J Kgm-1K-1) |
410 |
| Dielectric Constant at 1MHz |
7.33 |
| Elastic Coefficients |
C11 = 89.2 C12
= 40.0 C44 = 25.4 |
| Apparent Elastic Limit (Mpa) |
26.9 (3900psi) |
| Possion Ratio |
0.343 |
| Solubility in 100g water at 23¡ãC
(g) |
0.17 |
| Cleavage |
(111) |
Transmission Spectrum: (thickness of 10mm)
|
