the heating element being in contact with, or immersed in, the molten zone

Full Title

Single-crystal growth by zone-melting; Refining by zone-melting (C30B17/00 takes precedence; by changing the cross-section of the treated solid C30B15/00; under a protective fluid C30B27/00; for the growth of homogeneous polycrystalline material with defined structure C30B28/00) > Heating of the molten zone > the heating element being in contact with, or immersed in, the molten zone