| Orientation: | (1,1,2,0),(0,0,0,1),(1,1,0,2) |
| Orientation accuracy: | +/-0.5o |
| Purity: | 99.99% |
| Crystal structure: | trigonal system,corundum structure |
| Lattice constant: | a=4.758A c=12.991A |
| Color: | collorless |
| Hardness: | 9Mohs |
| Density: | 3.98 grams/cm3 |
| Melting Point: | 2030℃ |
| Growth method: | CZ |
| Thermal expansion coefficent: | 7x10-6/℃ |
| Thermal conductivity(W/(m.K)): | 46.06 AT 0℃,25.12 AT 100,12.56 AT 400℃ |
| Dielectric constant: | ~9.4 at 300K at A axis,~11.58 at 300K at C axis |
| Loss Tangent at 10 GHz: | <2x10-5 at A axis,<2x10-5 at C axis |