Abstract
Samples of stoichiometry (AgI)
4
(PbI
2
)
1−x
(CdI
2
)
x
, (0 ≤ x ≤ 0.4), have been prepared and studied by electrical conductivity, X-ray powder diffraction and DSC techniques. The ionic conductivity of samples was found to increase with temperature, and an abrupt increase at phase transition temperature was observed. The Cd
+2
-doped samples exhibited lower phase transition temperature compared to that of the pure samples. The ionic conductivity decreases with an increase in Cd
+2
content in pre-transition, while enhances in conductivity result in Cd
+2
content samples of x ≤ 0.2 in the post-transition region. Different resources of investigation confirmed the solubility limit of Cd
+2
in the high-temperature phase to be x = 0.2. The change in the ionic conductivity of Cd
+2
-doped samples is explained by the increase in the defect concentration and the free volume available in the lattice. The drop in phase transition temperature of Cd
2+
-doped systems is attributed to the lattice distortion and the increase in the defect-defect interaction.