Silicon
Si
SiliconSiliconSilicon

Crystal properties

Crystal Type

cubic, diamond structure

 

Transmission Range

1.2 ... 15 µm

Refractive Index

3.4179 @ 10 µm

Reflective Loss

46.1 % @ 10 µm

Density.

2.3291 g/cm3

Melting Point:

1420 °C

Molecular Weight:

28.086

Thermal Conductivity

163.32 W / (m K)

Specific Heat

703.4 J / (kg K) @ 25 °C

Thermal Expansion.

4.05 × 10–6 / K @ 10...50 °C

Hardness (Knoop)

1150 (Mohs 7)

Young’s Modulus

131 GPa

Shear Modulus

79.9 GPa

Bulk Modulus

102 GPa

Rupture Modulus

340 MPa

Elastic Coefficien

C11 = 167 / C12 = 65 / C44 = 80 Gpa

Dielectric Constant

13 @ f = 9.37 GHz

Solubility in Water

Insoluble

Crystal Structure

single crystal

Cleavage Planes

None

Application

material for IR optic and Electronics

List of Optical Crystals

Materials

Refractive Index

Transmission
Range (mm)

Density
(g/cm³)

Thermal Expansion  
Coefficient (10
-6/K) 

BK7 glass

1.5164 (588 nm)

0.330 – 2.1

2.51

  7.5 

SF11 glass

1.78472 (588 nm)

0.370 – 2.5

4.74

  6.8 

F2 glass

1.62004 (588 nm)

0.420 – 2.0

3.61

  8.2 

Fused Silica

1.4858 (308 nm)

0.185 – 2.5

2.20

  0.55 

CaF2

1.399  (5.0 mm)

 0.170 – 7.8

3.18

18.85 

BaF2

 1.460 (3.0 um)

 0.15 – 12.0

4.88

18.4 

Sapphire

1.755 (1.0mm)

0.180 – 4.5

3.98

  8.4 

Silicon

3.4179 (10mm)

 1.200 – 7.0

2.33

  4.15 

Ge

4.003 (10 mm)

 1.900 – 16

5.33

  6.1 

ZnSe

2.40  (10 mm)

0.630 – 18

5.27

  7.8 

ZnS

2.2 (10mm)

0.380 –14

4.09

  6.5 

LiF

1.39 (500 nm)

 0.150 – 5.2

2.64

37 

KBr

1.526 (10 mm)

 0.280 – 22

2.75

43 

 MgF2

no =  1.3836  ne = 1.3957 (405 nm)

0.130 – 7.0

7.37

a: 13.7
b: 8.48 

YVO4

no = 1.9500  ne = 2.1554 (1.3 mm)

0.400 – 5.0

4.22

a: 4.46
b: 11.37 

Calcite

no =  1.6557  ne = 1.4852 (633 nm)

0.210 – 2.3

2.75

a: 24.39
b: 5.68 

Quartz

no =  1.5427  ne = 1.5518 (633 nm)

0.200 – 2.3

2.65

7.07 

α-BBO

no =  1.6749  n= 1.5555 (532 nm)

0.190 – 3.5

3.85

a: 4.0
c: 36 

LiNbO3

 no =  2.2863  ne = 2.2027 (633 nm)

0.370 – 4.5

4.64

a: 16.7
c: 2.0