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氟化钡 Barium Fluoride (BaF2)


Crystallographic


Syngony

Cubic

Symmetry Class

m3m

Lattice Constants

a = 6.196 Å

c = a

Cleavability

(111), perfect


Optical


Refractive Index at ne

1.4759

Refractive Index at nF' - nC'

0.0059

Refractive Index at n10.6

1.3926

Refractive Index at n8.0 - n12.5

0.0673

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

(-1.27) ... (-1.51) x 10-5

Transmission Range, microns

0.15 - 12.5

Absorbance μ (λ), cm-1


at 0.2 microns

0.2

at 0.4 microns

0.08

at 10.6 microns

0.13


Thermal


Thermal Linear Expansion, ℃-1

for ±60 ℃

(16.5 ... 19.2) x 10-6

Thermal Conductivity, W/(m * ℃)

at 38 ℃

7.1

Specific Heat Capacity, J/(kg * ℃)

0.456 x 103

Thermal Stability, ℃

10 ±2

Melting Point, ℃

1354


Mechanical


Density, g/cm3 at 20 ℃

4.83

Mohs Hardness

3

Vickers Microhardness, Pa

82 x 107

Constants of Elastic Compliance, Pa-1

S11 = 15.30 x 10-12

S12 = -4.69 x 10-12

S44 = 39.47 x 10-12

Young Modulus (E), Pa


in <100> direction

6.54 x 1010

in <111> direction

6.63 x 1010

Shear Modulus (G), Pa


in <100> direction

2.51 x 1010

in <111> direction

2.53 x 1010

Poisson Ratio

0.307


Chemical


Molecular Weight 175.3
Solubility


in water, gram/100 cm3 0.17
in acids soluble


Ref. Index vs. Wavelength λ


Wavelength, Microns Refractive Index

0.2

1.5573

0.5

1.4779

1.0

1.4686

2.0

1.4647

3.0

1.4612

4.0

1.4558

5.0

1.4511

6.0

1.4441

7.0

1.4357

8.0

1.4258

9.0

1.4144

10.0

1.4014

11.0

1.3865

12.0

1.3696

12.5

1.3585

15.0

1.3050


Internal Transmittance τ i (λ) vs. Wavelength λ


Wavelength, Microns Internal Transmittance

0.2

0.70

0.5

0.96

1.0

0.97

3.0

0.97

5.0

0.97

6.0

0.97

7.0

0.97

8.0

0.97

9.0

0.70

10.0

0.85

12.0

0.42



Custom sizes and specifications are available on request.


 

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