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Barium Fluoride (BaF2)

Barium Fluoride is transparent over a wide spectrum range of 0.15-12.5um, and can be manufactured into windows, lens and prisms. It responds to X-rays, gamma rays as well as other high energy particles, which is suitable as a scintillator. It has several scintillation emission bands. The fast one is centered at 220nm with a decay constant of 0.6ns; the slow scintillation band is centered at 310nm with a decay constant of 620ns. It is sensitive to thermal shock and fractures easily.

                              Figure 1: External transmittance curve of Barium Fluoride crystal

  Crystal Structure Cubic
  cleavage plane <111>
  Lattice Constant (Å) 6.196
  Transparency Range (um) 0.15 ~ 12.5
  Constant of Dispersion (dn/dT)
(/°C at 0°C and 3.39um )
  Melting Point (°C)
  Thermal Conductivity (W/(m K) at 286 K):
  Heat Capacity: (J/gK at 276 K):
  Linear Coefficient of Thermal Expansion (0°C)  ( /°C)
  Refractive Indices n=1.47 at 1um
  n=1.40 at 10um
  Density (g/cm3) 4.89
  Mohs Hardness 3  
  Young's Modulus (GPa) 65.4 at <100>
 66.3 at <111>
  Shear Modulus (GPa) 25.1 at <100>
 25.3 at <111>
  Poisson Ratio 0.307  
  scintillation peak mission (nm) 220 for fast, 310 for slow
  Decay constant(ns) 0.6 for fast, 620 for slow  
  Photoelectron Yield [% of Nal(TI)] 4 for fast, 20 for slow
  Table 1:Barium Fluoride Properties

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