Istituto dei materiali per l'elettronica ed il magnetismo     
Attolini G., Paorici C., Pelosi C. Iodine Detection in Iodine-Doped CdS Singles Crystals. Rapporto interno n. 29. Technical report, 1976.
The detection of iodine traces in the 80-1600 ppm range in small size 15-115 mg CdS crystals has been proved feasible by a DEP version of argentometric titration. The silver ions, used as a titrant, were directly introduced in the solution to be titrated by coulo-generation. The analytical method described, accurate within -10%, is particularly suitable for low-cost routine analyses of small samples such as crystals grown by vapour-phase chemical transport. As an application of the method, the analytical results were used to evaluate the iodine distribution constant between solid and vapour phase. A value of 1.3 X 10-10 (g-at of iodine)3 (mol Cds)-3(atm)-1 at a growth temperature of 1123 was found, in reasonable agreement with previously reported values.
Subject CdS Crystals

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