Mateck Magnesium Fluoride (MgF 2 )

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Mateck Magnesium Fluoride (MgF₂)
Categories:	Ceramic; Halide
Material Notes:	Optical crystals
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Physical Properties	Original Value	Comments

Density	3.18 g/cc
Solubility	0.0076 ppm
a Lattice Constant	4.64 Å
c Lattice Constant	3.06 Å
Molecular Weight	62.32 g/mol

Mechanical Properties	Original Value	Comments
Vickers Microhardness	2890	MPa
	4410	MPa
Hardness, Mohs	6.0
Modulus of Elasticity	79.7 GPa	parallel to c-axis
	169.1 GPa	perpendicular to c-axis
Poissons Ratio	0.577
Shear Modulus	57.1 GPa	perpendicular to c-axis
	95.2 GPa	parallel to c-axis

Thermal Properties	Original Value	Comments
CTE, linear	6.23 - 9.25 µm/m-°C @Temperature -60.0 - 60.0 °C	perpendicular to c-axis
	10.86 - 14.54 µm/m-°C @Temperature -60.0 - 60.0 °C	parallel to c-axis
Specific Heat Capacity	0.920 J/g-°C
Melting Point	1255 °C

Optical Properties	Original Value	Comments
Refractive Index	1.3904	at nf' - nc'
	1.3044 @Wavelength 7000 nm	no
	1.3101 @Wavelength 7000 nm	ne
	1.3618 @Wavelength 3000 nm	no
	1.3724 @Wavelength 3000 nm	ne
	1.3786 @Wavelength 546.1 nm	at ne
	1.4231 @Wavelength 200 nm	no
	1.4367 @Wavelength 200 nm	ne
Transmission, Visible	97 % @Wavelength 500 nm	Internal Transmittance
IR Transmittance	12 % @Wavelength 8000 nm	Internal Transmittance
	91 % @Wavelength 6000 nm	Internal Transmittance
UV Transmittance	95 % @Wavelength 200 nm	Internal Transmittance

Descriptive Properties
Cleavability	(100)	perfect
	(110)
Constants of Elastic Compliance (Pa^-1)	1.053E-11	S66
	1.245E-11	S11
	-1.66E-12	S13
	1.754E-11	S44
	5.94E-12	S33
	-7.16E-12	S12
Symmetry	tetragonal
Symmetry Class	4/mmm
Thermal Coefficient of Refractive Index	1.5E-6 to 1E-6	ß0 at 3.39 microns for ±60°C
	1.5E-6 to 1E-6	ße at 3.39 microns for ±60°C
Transmission Range (microns)	0.13 - 0.7

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