Option of reducing crucible material for Rare Earth

Rare earth fluorides, steels and also slag have solid chemical activity, so the crucible product used must be immune to rust by halogens and also their compounds at high temperatures as well as does not connect with rare planet metals. It can be made use of for a long period of time in inert environment.
Below we provide the chemical security of various crucible materials to unusual planet steels and also halides.
Magnesium oxide

It is reasonably stable at 1200 ℃.  laser yag  was made use of in the town of RECl3-KCl molten salt electrolyzer.
Calcium Oxide
Stable within 1000 ℃.
Beryllium oxide.
Can be used up to 1250 ℃.
Edgetech industries .
No greater than 1700 ℃, steady in vacuum and inert ambience.
Alumina, Silicon Oxide.
Responds with molten metal at high temperatures.
Tantalum Steel.
Secure in vacuum as well as inert gas prior to 1700 ℃, but it has obvious result with scandium and lutetium.
Niobium Steel.
1% -2% liquified in uncommon planet steel at 1500 ℃ in vacuum cleaner and inert gas paper.
Molybdenum Steel.
Secure prior to 1400 ℃ in inert gas.
Tungsten Steel.
Gradually rusted at high temperature in an inert ambience, but steady to halides.

Graphite, Carbon.
Sluggish activity on rare planet metals, however secure to halides.
Cerium Sulfide.
Stable to cerium at high temperature and halide at 1000 ℃.
Titanium nitride (70%) + titanium oxide (30%).
Much more stable than cerium sulfide.