Electrical properties of AgLaOS and AgLaOS + 0.15La2O2S
Abstract Total (electronic and ionic) and silver ionic conductivities of AgLaOS and AgLaOS + 0.15La 2 O 2 S were measured by the dc four-probe method under a purified helium gas atmosphere at 323–723 K, The activation energy given by the silver ionic conductivity data of AgLaOS + 0.15La 2 O 2 S was 0.107 eV at 423–723 K. The silver ionic transport numbers of AgLaOS and AgLaOS + 0.15La 2 O 2 S at 723 K, determined by the, Tubandt method, were 0.066 and 0.48 respectively. The difference of the maximum and minimum values of x in Ag x LaOS at 723 K, i.e., ( x max − x min ) at 723 K, determined by Wagner's solid-state coulometric titration method, was 0.0023.