CdS and ZnS crystals were grown using the sublimation method by controlling the vapour pressure of the constituent elements. The crystallographic polarity of the grown crys-tals was determined by chemical etching. In the growth of US or ZnS crystals on almina substrates under 2
Pcd_??_
Ps2, or 2
Pzn P
s2, it was found that US crystals grew in the +
c direction at the initial stage, while ZnS crystals grew in the -
c direction. In the case of a prolonged growth time, growth along the -
c direction became predominant for both CdS and ZnS crystals. US and ZnS ctystals on carbon substrates grew in both the
c directions at the initial stage and grew preferentially in the -
c direction after a prolonged growth time. Effects of excess constituent elements on the polarity of the grown crystals are discussed.
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