THE PREPARATION AND PROPERTIES OF POLYCRYSTALS OF SOLID-ELECTROLYTE ULTRAFINE PARTICLES

We have investigated the transport properties of polycrystals of solid electrolytes, CuBr(I), CuCl(I), and AgI, by compressing submicron par ticles prepared by the evaporation method. The pellets of as-grown CuB r and CuCl particles tend to be contaminated by Cu(II), which may caus e charge transport by hole conduction. After the CuCl particles are tr eated with acetone, the pellet shows significant ionic conduction. The pellet of purified particles 0.4-mu m CuCl has a conductivity of 5 x 10(-7)Ohm(-1)cm(-1) at 25 degrees C, and activation energy for conduct ion of 0.44 eV. The 0.7-mu m AgI pellet also shows an enhanced conduct ivity of 5 x 10(-5)Ohm(-1)cm(-1) at 25 degrees C, and activation energ ies of 0.04 eV between 60 and 5 degrees C, and 0.23 eV below -25 degre es C.