Deviations from Stoichiometric Proportions in Cuprous Iodide

Abstract

The absorption of iodine by cuprous iodide has been studied by means of a quartz micro‐balance. At 132.1°C the concentration of absorbed iodine varies as the square root of the pressure of iodine vapor in equilibrium with the sample. The temperature dependence of the the reaction at constant iodine vapor pressure indicates a heat of reaction of 0.24 ev per atom absorbed. The electrical conductivity of cuprous iodide at 132.1°C varies approximately as the 4/3 power of the concentration of the absorbed iodine.