Mateck Barium Fluoride, BaF 2

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Mateck Barium Fluoride, BaF₂
Categories:	Ceramic; Halide
Material Notes:	Optical crystals
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Physical Properties	Original Value	Comments

Density	4.83 g/cc @Temperature 20.0 °C
Solubility	0.17 ppm
a Lattice Constant	6.196 Å
c Lattice Constant	6.196 Å
Molecular Weight	175.3 g/mol

Mechanical Properties	Original Value	Comments
Vickers Microhardness	820	MPa
Hardness, Mohs	3.0
Modulus of Elasticity	65.4 GPa	<100> direction
	66.3 GPa	<111> direction
Poissons Ratio	0.307
Shear Modulus	25.1 GPa	<100> direction
	25.3 GPa	<111> direction

Thermal Properties	Original Value	Comments
CTE, linear	16.5 - 19.2 µm/m-°C @Temperature -60.0 - 60.0 °C
Specific Heat Capacity	0.456 J/g-°C
Thermal Conductivity	7.10 W/m-K @Temperature 38.0 °C
Melting Point	1354 °C

Optical Properties	Original Value	Comments
Refractive Index	1.3926	at n10.5
	1.305 @Wavelength 15000 nm
	1.4014 @Wavelength 10000 nm
	1.4647 @Wavelength 2000 nm
	1.4759 @Wavelength 546.1 nm	at ne
	1.5573 @Wavelength 200 nm
IR Transmittance	42 % @Wavelength 12000 nm	Internal Transmittance
	97 % @Wavelength 1000 nm	Internal Transmittance
	97 % @Wavelength 7000 nm	Internal Transmittance
UV Transmittance	70 % @Wavelength 200 nm	Internal Transmittance

Descriptive Properties
Absorption loss (cm^-1)	0.08	at 0.4 microns
	0.13	at 10.6 microns
	0.2	at 0.2 microns
Cleavability	(111)	perfect
Constants of Elastic Compliance (Pa^-1)	1.53E-11	S11
	39.47	S44
	-4.69E-12	S12
Symmetry	cubic
Symmetry Class	m3m
Thermal Coefficient of Refractive Index	-1.27E-5 to -1.51E-5	3.39 microns for ± 60°C
Thermal Stability, °C	10±2
Transmission Range (microns)	0.15 - 12.5

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