Mateck Lithium Fluoride (LiF)

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Mateck Lithium Fluoride (LiF)
Categories:	Ceramic; Halide
Material Notes:	Optical crystals
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Physical Properties	Original Value	Comments

Density	2.60 g/cc
Solubility	0.27 ppm
a Lattice Constant	4.026 Å
c Lattice Constant	4.026 Å
Molecular Weight	25.94 g/mol

Mechanical Properties	Original Value	Comments
Vickers Microhardness	980	MPa
Hardness, Mohs	4.0
Modulus of Elasticity	88.4 GPa	in <100> direction
	142.2 GPa	in <111> direction
Poissons Ratio	0.27
Shear Modulus	40.9 GPa	in <100> direction
	62.9 GPa	in <111> direction

Thermal Properties	Original Value	Comments
CTE, linear	28.1 - 34.8 µm/m-°C @Temperature -60.0 - 60.0 °C
Specific Heat Capacity	1.562 J/g-°C
Thermal Conductivity	14.2 W/m-K @Temperature 38.0 °C
Melting Point	870 °C

Optical Properties	Original Value	Comments
Refractive Index	1.101 @Wavelength 10000 nm
	1.262 @Wavelength 7000 nm
	1.3871 @Wavelength 1000 nm
	1.3931 @Wavelength 546.1 nm	at ne
	1.439 @Wavelength 200 nm
IR Transmittance	14 % @Wavelength 7000 nm	Internal Transmittance
	97 % @Wavelength 1000 nm	Internal Transmittance
	97 % @Wavelength 3000 nm	Internal Transmittance
UV Transmittance	90 % @Wavelength 200 nm	Internal Transmittance

Descriptive Properties
Cleavability	(100)	perfect
Constants of Elastic Compliance (Pa^-1)	1.132E-11	S11
	1.591E-11	S44
	-3.06E-12	S12
Symmetry	cubic
Symmetry Class	m3m
Thermal Coefficient of Refractive Index	-1.25E-5 to -1.51E-5	at 3.39 microns for ± 60°C
Transmission Range (microns)	0.12 - 6.5

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Lithium Chloride, LiCl
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Lithium Borohydride, LiBH₄
Lithium Borate, LiBO₂

CMAT047 / 87731

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