About the service
We offer annealing of samples under ultra-high gas pressure in the high-pressure chambers of the Crystal Growth Laboratory (NL-3). Chambers of Ø30, Ø40, Ø60 and Ø100 mm are available, with graphite, BN and alumina crucibles.
Process parameters
- Pressures from 20 bar up to 10 kbar (up to 20 kbar in the Ø30 chamber)
- Temperature: up to 1450 °C (NL-3 high-pressure systems)
- Atmosphere: high-purity N2, Ar or He
- Max. heating rate: 1600 °C/h
- Max. cool-down rate (power off): ~2400 °C/h – nonlinear, depends on anneal temperature and chamber size
- Samples can be stacked with ~1 mm spacers (sapphire, GaN, graphite, alumina, GaN powder); very tall stacks are not advised due to vertical temperature gradients (up to 10 °C)
- Other crucible sizes available on special request (additional time and cost)
Available crucibles
| Type | Material | Horizontal dimensions | Height | Suggested max. sample size |
|---|---|---|---|---|
| Ø30 chamber – horizontal | ||||
| A | Alumina | Ø 10 mm | 7.5 mm | 5 × 5 mm |
| Ø40 chamber – vertical | ||||
| A | Graphite / BN | Ø 14 mm | 7 mm | 9 × 9 mm |
| B | Graphite | 13.5 × 13.5 mm (rounded edges) | 12 mm | 10 × 10 mm |
| C | Alumina | Ø 13 mm | 12 mm | 8 × 8 mm |
| D | Alumina | Ø 14.5 mm | 8.5 mm | 9 × 9 mm |
| Ø60 chamber – vertical | ||||
| A | Graphite / BN | Ø 22.5 mm | 10 mm | 15 × 15 mm |
| B | Graphite | Ø 26 × 22.5 mm (flattened) | 15 mm | 17 × 17 mm |
| C | Alumina | Ø 26 × 22.5 mm (flattened) | 29 mm | 17 × 17 mm |
| Ø100 chamber – vertical, requires further consultation | ||||
| A | Graphite | Ø 52 mm | 15 mm | 2 inches |
Contact and inquiries
Individual quote - depending on specification