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氟化镁 Magnesium Fluoride (MgF2)

 

Crystallographic

 

Syngony

Tetragonal

Symmetry Class

4/mmm

Lattice Constants

a = 4.64 Å

c = 3.06

Cleavability

(100),(110) perfect

 

Thermal

 

Refractive Index at ne

1.3786

Refractive Index at nF' - nC'

1.3904

Refractive Index at n10.6

0.0034

Refractive Index at n8.0 - n12.5

0.0110

Thermal Coefficient of Refractive Index at 3.39 microns for ±60 ℃

βo = (0.15 ... 0.10) x 10-5

βe = (0.15 ... 0.10) x 10-5

Transmission Range, microns

0.13 - 7.0

 

Thermal

 

Thermal Linear Expansion, ℃-1 for ±60 ℃


to c-axis

(6.23 ... 9.25) x 10-6

|| to c-axis

(10.86 ... 14.54) x 10-6

Specific Heat Capacity, J/(kg * ℃)

0.9200 x 103

Melting Point, ℃

1255

 

Mechanical

 

Density, g/cm3 at 20 ℃

3.18

Mohs Hardness

6

Vickers Microhardness, Pa


to c-axis

441 x 107

|| to c-axis

289 x 107

Constants of Elastic Compliance, Pa-1

S11 = 12.45 x 10-12 S12 = -7.16 x 10-12

S13 = -1.66 x 10-12 S33 = 5.94 x 10-12

S44 = 17.54 x 10-12 S66 = 10.53 x 10-12

Young Modulus (E), Pa


to c-axis

16.91 x 1010

|| to c-axis

7.97 x 1010

Shear Modulus (G), Pa


to c-axis

5.71 x 1010

|| to c-axis

9.52 x 1010

Poisson Ratio


|| to c-axis

0.577

 

Chemical

 

Molecular Weight

62.32

Solubility


in water, gram/100 cm3

0.0076

in acids

soluble

 

Ref. Index vs. Wavelength λ

 

Wavelength, Microns

Refractive Index no

Refractive Index ne

0.2

1.4231

1.4367

0.5

1.3797

1.3916

1.0

1.3736

1.3852

2.0

1.3686

1.3797

3.0

1.3618

1.3724

4.0

1.3525

1.3622

5.0

1.3400

1.3487

6.0

1.3242

1.3315

7.0

1.3044

1.3101

 

Internal Transmittance τ i (λ) vs. Wavelength λ

 

Wavelength, Microns

Internal Transmittance

0.2

0.95

0.5

0.97

1.0

0.97

3.0

0.97

5.0

0.97

6.0

0.91

7.0

0.54

8.0

0.12


Custom sizes and specifications are available on request.


 

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