Optical and spectral properties | |
|---|---|
Transmission range in µm (minimum 10%) | 0.14-6.4 0.15-5.4 (parallel to c-axis) |
Transmission range in µm (minimum 50%) | 0,16‐4 |
Refractive index @633nm | 1.766 (no) 1.758 (neo) |
Reflection losses in % at 1 surface | 6.94 @2.9µm
|
Reflection losses, % for two surfaces | 14 @0.06µm
|
dN/dT in 1/K | 13.6 · 10-6
|
Physical properties | |
|---|---|
Density in g/cm3 | 3.97-3.99
|
Melting point in °C | 2053
|
Specific heat capacity in J/(kg · K) | 753
|
Thermal conductivity in W/(m · K) | 32.5 (parallel to c-axis) 30.3 (perpendicular to c-axis) |
Thermal expansion in 1/K | 6.6 · 10-6 (parallel to c-axis) 5 · 10-6 (perpendicular to c-axis) |
Dielectric constant | 11.5 (parallel c-axis) 9.3 (perpendicular to c-axis) |
Solubility in water in g/100g | insoluble |
Mohs hardness | 9
|
Knoop hardness in kg/mm² | 2200 (parallel to c-axis) 1900 (perpendicular to c-axis) |
Material type | single crystalline, synthetic
|
Crystal type | hexagonal |
Crystal structure | R3c
|
Lattice constant in Å | a = 4.785 c = 12.991 |
Elastic coefficient in GPa | C11 = 497 C12 = 164 C33 = 498 C44 = 147 C13 = 111 C14 = 24 |
Young's Modulus (E) in Gpa | 360-440
|
Shear Modulus (G) in GPa | 145 |
Bulk Modulus (K) in GPa | 145 |
Rupture Modulus in MPa | 450‐900
|
Apparent elastic limit in MPa | 480‐890
|
Poisson's ratio | 0.27-0.3
|
| Spectral properties | |
|---|---|
 |
|
| sample thickness: 2 mm | |
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