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

<p><span>In this paper, </span><span>SrLaLiTe_1-<i>x</i>Mn<i>_x</i>O₆</span><span> (<i>x </i>= 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, </span><i><span>P2₁/n</span></i> <span>symmetry.</span><span> As dopant concentration increased, </span><span>field emission scanning electron microscope (</span><span>FESEM) characterization used to found that larger grains were formed from<i> x </i>= 0.04 to <i>x</i> = 0.08 and affected dielectric properties studied by electrochemical impedance spectroscopy (EIS) characterization which showed enhancement of real dielectric permittivity, </span><i><span>ε</span></i><span>'</span>_{<span>. </span>}<span> Dielectric property also showed non</span><span>–</span><span>Debye trend of DC conductivity, </span><i><span>σ_DC</span></i><span>. AC conductivity,</span><i><span> σ_AC</span></i><span> revealed</span><span> frequency dependent plot that obey the universal power law at all temperatures</span><span> applied and the</span> <i><span>σ_AC</span></i><span> behaviour in </span><span>SrLaLiTe_1-<i>x</i>Mn<i>_x</i>O₆</span><b></b><span>is due to the tunnelling of polarons. </span></p>