Abstract

Development of optical high-temperature furnace and its application to the analysis of optoelectronic property of the ionic conductorAgI

Author(s): Toshifumi Iimori, Rahima Khaton, Masashi Takei, Tatsuji Meike, Nobuhiro Ohta

The temperature dependence of the electrical conductivity of polycrystalline silver iodide and photoirradiation effect on it are studied by using a compact high temperature furnace that is developed for the analysis of photoirradiation effects on electrical properties of solidmaterials.With this apparatus, experiments at different temperatures under various environments, i.e., under any gaseous condition or under vacuum condition are possible. The sample composed of the -phaseAgI shows a hump at ~70 C in the resistance as a function of temperature. This result suggests the transformation from the -phase at this temperature. In the aged sample composed of the mixture of the -phase and -phase, a monotonic decrease of the resistance with the increase of temperature is observed below147 C, at which the phase transition to the superionic conducting -phase takes place. In the polarized -phase sample at 155 C, the conductivity change is induced by the photoirradiation of the visible light of 450 nm.