| Transmission Range | 0.3 to 5 μm |
| Refractive Index | 1.71 at 0.6 μm |
| Reflection Loss | 13% at 0.6 μm (2 surfaces) |
| Absorption Coefficient | 0.02 cm-1 @ 0.6 μm |
| Reststrahlen Peak | n/a |
| dn/dT | 12 x 10-6 K-1 |
| dn/dμ | n/a |
| Density | 4.58 g/cc |
| Melting Point | 2135°C |
| Thermal Conductivity | 14.6 W m-1 K-1 (varies with porosity) |
| Thermal Expansion | 6.5 x 10-6 K-1 |
| Hardness | Knoop 1140 with 1000g indenter (8 Moh) |
| Specific Heat Capacity | 1086 J Kg-1 K-1 |
| Dielectric Constant | 8 |
| Young's Modulus (E) | 195 GPa |
| Shear Modulus (G) | 157 GPa |
| Bulk Modulus (K) | 200 GPa |
| Elastic Coefficients | C11 = 298; C12 = 154; C44 = 157 (2) |
| Apparent Elastic Limit | 170 MPa (24,600 psi) |
| Poisson Ratio | 0.26 |
| Solubility | Insoluble in water |
| Molecular Weight | 142.27 |
| Class/Structure | Cubic Fd3m (#227), irregular cleavage on (111) |
| μm1 | No1 | μm2 | No2 | μm3 | No3 |
|---|---|---|---|---|---|
| 0.36 | 1.7461 | 1.471 | 1.695 | 5.556 | 1.565 |
| 0.40 | 1.7638 | 2.00 | 1.686 | 6.25 | 1.522 |
| 0.50 | 1.7229 | 2.50 | 1.677 | 6.667 | 1.491 |
| 0.60 | 1.7156 | 3.125 | 1.662 | 6.897 | 1.473 |
| 0.70 | 1.7111 | 3.704 | 1.645 | ||
| 1.042 | 1.702 | 4.00 | 1.635 | ||
| 1.25 | 1.698 | 5.00 | 1.594 |
Spinel is a naturally occurring material often used as a gemstone. Optical spinel is a fused compacted ceramic material formed from spinel powder. It is polycrystalline with a grain size in the range of 25μm to 150μm
1. https://www.mindat.org/min-3729.html
2.Schrieber. Elastic Modulii of Single Crystal Spinel. J App. Phys 38, 2508 (1967)