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氟化钙 Calcium Fluoride (CaF2)


Crystallographic


Syngony

Cubic

Symmetry Class

m3m

Lattice Constants

a = 5.462 Å

c = a

Cleavability

(111), perfect


Optical


Refractive Index at ne

1.4349

Refractive Index at nF' - nC'

0.0043

Refractive Index at n10.6

1.2996

Thermal Coefficient of Refractive Index at 3.39 microns for

±60 ℃

(-0.95) ... (-1.17) x 10-5

Transmission Range, microns

0.15 - 9.0


Thermal


Thermal Linear Expansion, ℃-1 for ±60 ℃

(16.5 ... 19.4) x 10-6

Thermal Conductivity, W/(m * ℃) at 36 ℃

9.71

Specific Heat Capacity, J/(kg * ℃)

0.8876 x 103

Thermal Stability, ℃

20 ±2

Melting Point, ℃

1418


Mechanical


Density, g/cm3 at 20 ℃

3.18

Mohs Hardness

4

Vickers Microhardness, Pa

165 x 107

Constants of Elastic Compliance, Pa-1

S11 = 6.83 x 10-12 S12 = -1.53 x 10-12

S44 = 29.58 x 10-12

Young Modulus (E), Pa


in <100> direction

14.61 x 1010

in <111> direction

8.99 x 1010

Shear Modulus (G), Pa


in <100> direction

4.76 x 1010

in <111> direction

3.38 x 1010

Poisson Ratio

0.216


Chemical


Molecular Weight

78.08

Solubility


in water, gram/100 cm3

0.0016


Ref. Index vs. Wavelength λ


Wavelength, Microns

Refractive Index

0.2

1.4951

0.5

1.4365

1.0

1.4289

2.0

1.4239

3.0

1.4179

4.0

1.4096

5.0

1.3990

6.0

1.3856

7.0

1.3693

8.0

1.3498

9.0

1.3268

10.0

1.3002

11.0

1.2676

12.0

1.2299


Internal Transmittance τi (λ) vs. Wavelength λ


Wavelength, Microns

Internal Transmittance

0.2

0.87

0.5

0.97

1.0

0.99

3.0

0.99

5.0

0.99

6.0

0.98

7.0

0.97

8.0

0.88

9.0

0.59

10.0

0.19


Custom sizes and specifications are available on request.

 

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