氟化钙

氟化钙

CaF2 crystal is high in hardness and strong in resistance to mechanical shock andthermal shock, which has excellent transmittance at ultraviolet, visible andinfrared wavelength band. It is widely used in such technical domains as laser,infrared optics, ultraviolent optics, high energy detector, etc. It is a knownoptical crystal at ultraviolet ending wavelength band, whose opticalperformance is especially good at ultraviolent wavelength band. With hightransmittance and little fluorescent radiation, it is the ideal material forUV-light detectors, ultraviolent lasers and ultraviolet optical system. UnlikeCaF2, MgF2 is a kind of birefringent crystal.
 Physicalproperty:

Density (g . cm-3 )

(CaF2)

(Mgf2)

Density (g . cm-3 )

3.18

3.177

Dielectric constant

6.76 @1HMZ

4.87(parallel to axis C),5.44(vertical to axis C )

Melting point (℃)

1360

1255

Chemical purity (%)

99.9996

99.9996

Coefficient of thermal expansion (1/℃)

18.85* 10-6

13.7* 10-6(parallel) 驶8.48* 10-6(vertical)

7.3* 10-6@373k

7.0* 10-6@373k

Thermal conductivity (J/k .m. s)

9.71

0.3 @ 27℃

Thermal capacity (J/g .k)

0.854

1.003 @ 298k

Knoop hardness (kg/mm2)

158.3

415

Young modulus (Gpa)

75.8

138.5

Shear modulus (GPa)

33.77

15.66

Poisson’s ratio

0.26

0.276

Bulk modulus (Gpa)

82.71

101.32

Opticalproperty:

 

(CaF2)

(MgF2)

Transmitted wavelength range

130nm---10000nm

110nm—7500nm

Reflection loss(two sides)

5.4% @ 5000nm

11.2% @ 120nm

5.1% @ 1000nm

Thermo-optical coefficient dn/dT(1/℃)

-10.6*10-6

2.3*10-6 @ 400mnm

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