An Edwards’ 306 coating system is used to produce self-supporting films by evaporation of samples onto glass slides or backing foils.
The source material is heated resistively by passing a high current through the filament or boat that holds it. The vapour escapes from the source and condenses onto all surfaces in its path. The work pieces, or substrates, are positioned at appropriate places in relation to the source. They become coated with thin layers of the material. This technique is known as evaporation or physical vapour deposition.
The target preparation laboratory at Daresbury uses three coating systems.
- Set up for evaporating Gold only
- Is used for general evaporations
- Reduction evaporations (the reduction of an isotopic element from its oxide to a pure form)