Effects of Mn6+ substitution on dielectric and optical characteristics of SrLaLiTeO6 double perovskite

In this paper, SrLaLiTe1-xMnxO6 (x = 0.02, 0.04, 0.06, 0.08, 0.10) double
perovskites compounds have been prepared using solid state method. Studies
on structural by applying X-ray diffraction (XRD) characterization found
that all compounds formed in monoclinic, P21/n symmetry. As dopant
concentration increased, field emission scanning electron microscope
(FESEM) characterization used to found that larger grains were formed from
x = 0.04 to x = 0.08 and affected dielectric properties studied by
electrochemical impedance spectroscopy (EIS) characterization which showed
enhancement of real dielectric permittivity, ε’.  Dielectric
property also showed non–Debye trend of DC conductivity, σDC. AC
conductivity, σAC  revealed frequency dependent plot that obey
the universal power law at all temperatures applied and the σAC behaviour
in SrLaLiTe1-xMnxO6 is due to the tunnelling of polarons.