Czochralski crystal growth crucible material

In the Czochralski method, the material is heated in a crucible just above its melting point. A seed crystal is immersed in the melt and it is slowly pulled out (5mm/min) from the melt vertically while being slowly twisted (2-20 rpm), resulting in continuous growth at the interface. The system is within a chamber with argon to avoid contamination. 

---