Structural and electrical properties of Li2AlMn3O8

Abstract

The spinel Li2AlMn3O8 was synthesized using a conventional solid-state method at 800°C for 12 h in air. The samples were analyzed using X-ray Diffraction (XRD) and Electrochemical Impedance Analyzer to study the structural and electrical properties of the samples. Well defined reflections were obtained with additional weak peaks of Al2O3. However, small values of χ2 indicating a good agreement between calculated and observed pattern. A single semicircle from the complex plane plot (Z” vs. Z’), and the capacitance value at the top point of semicircular arc was determined as a grain boundary region. The conductivity of Li2AlMn3O8 at room temperature is about 2.99 x 10-5 S cm-1. Meanwhile, the Arrhenius plot related from conductivity shows the activation energy also fairly similar at frequency range from 101 to 105 Hz.