Preparation, Electrical Conductivity and Phase Transition in [Ag2HgI4:0.2 AgI]:0.x KBr Type Mixed Composite System (x=0.2, 0.4, 0.6 mol. wt. %)

A novel mixed composite system, [ag2hgi4:0.2 agi]:0.x kbr, (x=0.2, 0.4, 0.6mol. wt. %), was prepared and [ag2hgi4:0.2 agi] composite system was used as the host.electrical conductivity was measured to study the transition behavior at frequencies of 100hz, 120 hz, 1 khz, and 10 khz in the temperature range of 90-170 °c using a genrad1659 rlc digibridge. conductivity increased sharply during the c-d phase transition. uponincreasing the dopant-to-host ratio, the conductivity of the superionic system exhibitedarrhenius (thermally activated)-type behavior. x-ray powder diffraction, dta, dtg andtga were performed to confirm the doping effect and transition in the host. the phasetransition temperature decreased with an increase in the dopant concentration. activationenergies in ev for pre- and post- transition phase behavior are also reported .