Selection of reducing crucible product for Rare Earth

Unusual planet fluorides, metals and slag have solid chemical task, so the crucible product made use of must be immune to deterioration by halogens and also their substances at high temperatures as well as does not communicate with unusual planet metals. It can be utilized for a very long time in inert environment.
Below we provide the chemical security of different crucible materials to rare earth metals and also halides.
neodymium yag laser  is reasonably stable at 1200 ℃. It was made use of in the village of RECl3-KCl molten salt electrolyzer.
Calcium Oxide
Stable within 1000 ℃.
Beryllium oxide.
Can be consumed to 1250 ℃.
High pureness zirconia.
No greater than 1700 ℃, steady in vacuum and inert environment.
Alumina, Silicon Oxide.
Responds with liquified metal at heats.

Tantalum Metal.
Steady in vacuum cleaner and inert gas before 1700 ℃, but it has apparent result with scandium as well as lutetium.
Niobium Metal.
1% -2% liquified in unusual planet steel at 1500 ℃ in vacuum and also inert gas paper.
Molybdenum Steel.
Stable before 1400 ℃ in inert gas.

Tungsten Metal.
Slowly corroded at high temperature in an inert ambience, yet stable to halides.
Graphite, Carbon.
Slow-moving activity on unusual earth metals, however secure to halides.
Cerium Sulfide.
Secure to cerium at heat and also halide at 1000 ℃.
Titanium nitride (70%) + titanium oxide (30%).
Much more stable than cerium sulfide.