The Pressure Dependence of Ionic Conductivity of Amorphous Lithium Ionic Conductor

The ionic conductivity and the activation volume of amorphous lithium ionic conductors B2O3-0.7Li2O-0.7LiCl-xAl2O3 (x=0.05 and 0.15) under pressure from the atmosphere to 0.80 GPa were investigated for the first time. It is found that their activation volumes have changed from negative to positive under a certain pressure. The first microcosmic explanation is given by the physics picture of the ionic transport passages. Moreover, the two kinds of specimen i. e., the whole large piece and the tablet of powder are compared; the effect of alumina content on the phase transformation pressure is discussed. The pressure relaxation has been observed, the ionic conductivity when unloading to the atmosphere increases by 10.4 times compared to the original one.