Room temperature effect on dislocations in CdI2crystals

Abstract

X-ray diffraction photographs of CdI2 crystals, grown from solution at room temperature, frequently exhibit streaking, arcing and polytypism. When the crystals were re-examined after three-four years, the streaking and the arcing were found to have changed. These changes are explained in terms of creation of stacking faults due to the dissociation of existing unit edge dislocations into partials and their movements at room temperatures varying from 5 to 45 °C during the year.