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	Metric	English	Comments

Density	4.83 g/cc @Temperature 20.0 °C	0.174 lb/in³ @Temperature 68.0 °F
Solubility	0.17 ppm	0.17 ppm
a Lattice Constant	6.196 Å	6.196 Å
c Lattice Constant	6.196 Å	6.196 Å
Molecular Weight	175.3 g/mol	175.3 g/mol

Mechanical Properties	Metric	English	Comments
Vickers Microhardness	820	820	MPa
Hardness, Mohs	3.0	3.0
Modulus of Elasticity	65.4 GPa	9490 ksi	<100> direction
	66.3 GPa	9620 ksi	<111> direction
Poissons Ratio	0.307	0.307
Shear Modulus	25.1 GPa	3640 ksi	<100> direction
	25.3 GPa	3670 ksi	<111> direction

Thermal Properties	Metric	English	Comments
CTE, linear	16.5 - 19.2 µm/m-°C @Temperature -60.0 - 60.0 °C	9.17 - 10.7 µin/in-°F @Temperature -76.0 - 140 °F
Specific Heat Capacity	0.456 J/g-°C	0.109 BTU/lb-°F
Thermal Conductivity	7.10 W/m-K @Temperature 38.0 °C	49.3 BTU-in/hr-ft²-°F @Temperature 100 °F
Melting Point	1354 °C	2469 °F

Optical Properties	Metric	English	Comments
Refractive Index	1.3926	1.3926	at n10.5
	1.305 @Wavelength 15000 nm	1.305 @Wavelength 15000 nm
	1.4014 @Wavelength 10000 nm	1.4014 @Wavelength 10000 nm
	1.4647 @Wavelength 2000 nm	1.4647 @Wavelength 2000 nm
	1.4759 @Wavelength 546.1 nm	1.4759 @Wavelength 546.1 nm	at ne
	1.5573 @Wavelength 200 nm	1.5573 @Wavelength 200 nm
IR Transmittance	42 % @Wavelength 12000 nm	42 % @Wavelength 12000 nm	Internal Transmittance
	97 % @Wavelength 1000 nm	97 % @Wavelength 1000 nm	Internal Transmittance
	97 % @Wavelength 7000 nm	97 % @Wavelength 7000 nm	Internal Transmittance
UV Transmittance	70 % @Wavelength 200 nm	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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CMAT038 / 87722

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