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 BaF2 - Barium Fluoride


BaF2 - Barium Fluoride - is a salt compound of barium and fluorine. In crystal form it is optically transparent over a wide range from the UV through to the IR and widely used to fabricate optical components and as a scintillator.  


BaF2 scintillator crystals:



Issues to be aware of:



Barium Fluoride - BaF2 - is a useful scintillator for applications such as:







Properties

Optical

Units

Value

Wavelength (Max. Emission)

nm

310 (Slow)

195/220 (Fast)

Lower Wavelength Cut-off

nm

135

Decay Times

ns

630 (Slow)

0.87/0.88 (Fast)

Light Yield

photons/keV

10 (Slow)

1.9 (Fast)

Photoelectron Yield

% of NaI(Tl)

16 (Slow)

3 (Fast)

Radiation Length

cm

2.06

Optical Transmission

µm

0.15 - 12.5

Transmittance

%

>90 (0.35 - 9µm)

Refractive Index


1.4626 (2.58µm)

Reflection Loss/Surface

%

6.8

Barium Fluoride - BaF2 - Scintillator Emission Wavelengths

Barium Fluoride - BaF2 Properties


Barium Fluoride - Scintillator Emission



Further Reading / Publications (Click for links)


Barium Fluoride - Wikipedia

Barium Fluoride - Details - Refractive Index

Barium Fluoride - Details - Chemical, Physical Properties

Barium Fluoride - Details - Optical Properties

Barium Fluoride - Characteristics of Scintillation Crystals

Barium Fluoride - Light Yield / Surface Treatment

Barium Fluoride - Light Yield

Barium Fluoride - PET Application

Barium Fluoride - Use in Optics

Properties

Mechanical

Units

Value

Density

g/cm³

4.88

Atomic Number (Effective)


56

Melting Point

ºK

1627

Thermal Expansion Coeff.

C⁻¹

18.4 x 10‾⁶

Cleavage Plane


<111>

Hardness

Mho

3

Hygroscopic


Slightly

Solubility

g/100gH0

0.17 (23ºC)

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BaF2 Scintillation Crystals - Sizes


Diameters:  Up to 380mm

Lengths:      Up to 250mm