Electrical properties of Ag5Te2Cl and Ag3TeBr
Abstract Electrical conductivity measurements on polycrystalline Ag 5 Te 2 Cl indicate the compound undergoes a covalent-superionic phase transition at a temperature of 328 K. Conductivity changes abruptly at the temperature by a factor of 25 while the activation energy for ionic motion transforms from 0.38 eV in the low temperature modification to 0.26 eV in the high temperature modification. Ag 3 TeBr does not exhibit any phase changes throughout the temperature range 150–400 K and its activation energy is found to be 0.35 eV.