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You are here: Home / Fluoride Crystal / BaF2
BaF2 Crystal- CRYLINK
BaF2 Block

Barium fluoride (BaF2) is a general-purpose optical window material that offers a wide range of transparency, from the ultraviolet to the long-wave infrared, with low reflectance loss and low dispersion. BaF2 single crystal is an intensively studied scintillator for the detection of gamma radiation due to its relatively high stopping power, radiation hardness and extremely fast response. BaF2 possesses the fast cross-luminescence component at 195 and 220 nm with a lifetime of several hundred picoseconds. However, this component coexists with slow one at 310 nm related to the self-trapped exciton (STE). BaF2 is a broad band gap crystal with Eg=10:9 eV. It is currently regarded as the fastest inorganic scintillator which has cross-luminescence bands peaked at 195 and 220 nm and a broad band peaking at about 300 nm due to self-trapped excitons. Much attention has been focused on the luminescent properties of rare earth ions activated BaF2.

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Parameter

Material and Specifications
Orientation[100] or [111] < ±0.5°
Angle Tolerance< 0.5°
Parallelism<20〞
Perpendicularity5ˊ
Surface Quality10-5 (MIL-O-13830A)
Wavefront Distortion<λ/4@633 nm
Surface Flatness<λ/8 @633 nm
Clear Aperture>90%
Thickness/Diameter Tolerance±0.05 mm
Physical and Chemical Properties
Crystal SystemIsometric
HabitCubic
Space GroupFm3m(Oh5
Lattice Constants6.2001 Å
Specific mass4.886 g/cm3
Melting Point1354°C
Flexure Strength (MPa)27
TenacityBrittle
Thermal Conductivity /(W·cm-1·K-1@25°C)0.07
Specific Heat/ (J·g-1·K-1)1.003
Thermal Expansion /(10-6·K-1@25°C )13.7
Hardness (kg/mm2@Knoop)78
Young`s Modulus /GPa138.5
Fracture {111} and {100}
Optical characteristics
Transmission Range0.15 … 12 µm  
Reflective Loss 6 … 16%@0.2 … 10 µm 
Thermo-optic coefficient(10-6·K-1@30…90°C )-18.8
Poisson Ratio0.31
Dielectric Constant7.33@f=2MHz
Index of Refraction
λ(μm)nλ(μm)nλ(μm)n
0.21.557341.455891.4144
0.51.477951.4511101.4011
11.468661.4441111.3865
21464771.4357121.3696
31.461281.425812.51.3585
    151.305
Spectrum

Feature
Application
Literature
Feature
  • Excellent transmission from 150nm to 12um
  • Chemically stable
  • Low reflectance loss and low dispersion 
  • High stopping power, radiation hardness and extremely fast response
  • Broad band gap
  • Susceptible to thermal shock
  • Possesses the fast cross-luminescence component at 195 and 220 nm with a lifetime of several hundred picoseconds
Application
  • Window and focusing mirror for deep uv and excimer lasers
  • Scintillator,IR optics
  • Inorganic scintillator for subnanosecond timing
Literature
Study of d0 magnetism of BaF 2 nanopowder after thermal and radiation exposure
Development of BaF 2 transparent ceramics and evaluation of the scintillation properties
 Investigation of the structure in oxyfluoride TeO 2 eP 2 O 5 based glasses with the various BaF 2 content
Spectroscopic properties of the gamma irradiated ErF 3 -DOPED BaF 2 crystals
Performance of the BaF2-calorimeter  TAPS 
TL properties of BaF 2 :Ce phosphor for high gamma ray dosimetry
Theoretical study of self-trapped hole diffusion in CaF 2 , SrF 2 , BaF 2 crystals
Diffusion of 5p-holes in BaF 2 nanoparticles
Electron transfer between heterogeneous lanthanides in BaF 2 crystals
Size effects and radiation resistance of BaF 2 nanophosphors

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