Proposed floating-zone, immersed-heater method for the growth of trigonal selenium single crystals

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Trigonal Se crystals grown from the melt in a vertical ampoule are strained because Se expands along the c-axis as it cools. In order to eliminate contact with the ampoule, a floating zone method of growth is proposed. Although the surface tension of liquid Se is too low to maintain an unsupported molten zone of practical dimensions, preliminary experiments have shown that a zone can be maintained by using a ribbon reisistance heater that passes through the zone. Thr charge would be doped with a small concentration of T1, which facilitates the crystallization of Se from the melt.