Electrooptic crystals

Bi₁₂SiO₂₀

Bi₁₂GeO₂₀

Bi₁₂TiO₂₀

Bi₂₅GaO₃₉

Bi₂₅FeO₃₉

Bi₃₈ZnO₅₈

Latice Parameter, nm

1.0104

1.0145

1.0174

1.0184

1.0194

1.0207

Specific weight g/cm3

9.20

9.22

9.07

9.35

9.27

9.31

Melting point, œC

900

923

875*

810*

795*

765*

Melting, heat, J/g

129.0

139.0

-

-

-

-

Coeff. of thermal expantion, 1/K

16.9 x10^-6

16 x10^-6

15.2 x10^-6

16.7 x10^-6

16.7 x10^-6

16.8 x10^-6

Hardness /Mooss

4.5

4.5

4.5

4.3

4.3

4.3

Compressive strength, kg/mm²

350

400

340

320

320

320

Transmission spectrum, mkm

0.4-7

0.4-7

0.45-7

0.4-7

0.45-7

0.4-7

Reflection index, n (l =630 nm)

2.54

2.54

2.56

2.57

2.57

2.59

Specific heat, J/g K

0.244

0.242

0.249

0.224

0.232

0.219

Electro-optic coeff,r

41

4.5

4.3

5.9

3.2

-

Band gap, eV

3.25

3.25

3.25

3.2

2.8

2.8

Resistivity,Ohm.cm

5.10¹⁵

5.10¹⁵

5.10¹⁴

5.10¹⁰

5.10¹²

5.10¹⁰

Magneto-optic coeff. Min/Oe.cm.

0.195

0.199

0.206

0.216

-

0.213

Optical activity (632.8 nm), grad/mm

22

21

7

18

-

-

Dielectric constant, e

52

46

55

34

80

63

Loss tangent, (f=1 kGz)

0.05

0.06

0.06

0.07

0.19

0.08

Piezoelectric modul, d14 10¹¹, C/N

4.01

3.44

3.72

2.92

3.21

-