Abstract
Single crystals of SnO 2 were grown by the chemical transport method from the powder prepared by heating hydrous stannic oxide. The transport reactions were carried out when iodine and sulfur were simultaneously used as transporting agent, and fine crystals of a few millimeters in dimensions were grown after a ten-day transport; the transport proceeded from 1100°C (charge) to 900°C part in a silica ampoule. The crystals were identified as SnO 2 (cassiterite) by the Weissenberg method. Thermodynamic calculations led to the equilibrium SnO 2 (s) + I 2 (g) + 1 2 S 2 (g) ⇋ SnI 2 (g) + SO 2 (g) for this transport reaction.
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