BaF2 Crystal

BaF₂ (Barium Fluoride) Crystal

BaF₂is relatively hard but is highly sensitive to thermal shock. For its transmission range is 0.2 μm - 11 μm, 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. BaF₂is less resistant to attack by water than CaF₂. Pronounced water attack occurs at 500 °C, but in a dry environment the material can be used up to 800 °C. BaF₂is grown by modified Bridgman technique. Maximum available size: Dia 200 mm x Thickness 50 mm. In addition, BaF₂is usually used as scintillator for gamma detection. It is the fastest scintillating crystals up to now.

Main Specifications:

Maximum Size	Single Crystal: φ100×100 mm Poly Crystal:φ200×100 mm (3 ~7 boundaries)
Dimension Tolerance	± 0.1mm
Flatness Tolerance	λ~ λ/10 at 632.8 nm over central 90% of edge dimensional
Parallelism	±1 arc sec ~ ±3 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)	3.2×10^-4
Density (g/cm³)	4.89
Melting Point (°C)	<1280
Thermal Conductivity at 286K (Wm^-1K^-1)	11.72
Thermal Expansion at 273K (K^-1)	18.1×10^-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°C (g)	0.17
Cleavage	(111)