Nickel and iron each have a vapor pressure of ~1E-2 Torr at around 1,500°C with nickel’s vapor pressure being slightly lower at any given temperature. Because the material rests at the bottom of the crucible and, typically, the crucible’s bottom is cooler than its sides, the heater and crucible must be heated to a much higher temperature to achieve evaporation. Therefore, a power supply may not be capable of getting the heater hot enough.
Category: Evaporation Sources
Sub-Category: Crucibles and Crucible Heaters