Investigation of the Effect of Ionic Transport Properties on Phase Transition in a [CdHgI4:xAgI] Type Mixed Composite System

An experimental investigations concerning the preparation and characterizationof the superionic composite system [cdhgi4:xagi], (x=0.2, 0.4, and 0.6 mol. wt. %), havebeen undertaken with a view to evaluate the ionic transport properties of the mixedcomposite system, and to identify the phase transition. powder samples of variouscompositions containing x mol. wt. %agi were synthesized by solid state reactions, where[cdhgi4] system was used as host. samples were analyzed using powder x-ray diffraction,thermal gravimetric analysis (tga) techniques. these studies have revealed the formationof new substance having phase transition temperature similar to that of agi. detailedelectrical conductivity measurement carried out at frequencies of 100 hz, 120 hz, 1 khz,and 10 khz in the temperature range 150-250 °c by a gen rad 1659 rlc digibridge, haveidentified the best conducting composition namely 4 mol. wt. %, exhibiting an electricalconductivity of 1.88×10-1 scm-2k at 543 k and an activation energy of 1.66 ev for ag+ ionmigration within the solid host. activation energies for the system in ev both for the pretransitionand post-transition phase transformations are reported .