Methods Used for Single Crystal Growth

Vapor Methods Used for Single Crystal Growth 

If the material whose single crystal we want is volatile or sublimable, then we may choose a vapor-method of cr3retal growth. These methods have been used for a variety of crystals including ZnS and CdS. In this method, a carrier- gas is most often used for material transport and for the 

- A Furnace for Growing Cr5rstals from the Vapor Phase 

In this method, we start the gas flow and then begin heating. It is important to heat the material to just below the point of sublimation (volatilization) and let the system come to equilibrium. Gas flow need not be rapid but needs to be sufficient to cany the volatiles to the cooler part of the furnace. The tube used in the furnace is most often a silica-tube, although metal tubes have sometimes been used. The choice depends upon the nature of the material being sublimed and crystallized. 

For ZnS and CdS, it is important to exclude all traces of oxygen since these materials are easily oxidized, namely- 

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Vapor Methods Used for Single Crystal Growth 292... 

The flux method is a well-known method used for single crystal growth. It has not been applied to the synthesis of fine powders because usually high temperature heating is necessary to obtain molten salts. However, the modified flux method has been reported for the preparation of fine panicles of Ce,. Pr Oj solid solutions.In the preparation of the powders by the flux method, molten salts of alkali metal hydroxides, nitrates, and chlorides are used as solvents. The use of molten salts. 

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