Characterization and Studies on AC Conductivity of CaMnO3 Material

Abstract

Synthesis of CaMnO3 has been performed by solid state reaction method using CaCO3 and MnCO3 powder as raw materials. The raw materials were weighed, milled, compacted into a pellet and then sintered at 1250°C. Phase of material, microstructure, and conductivity of the samples were observed. The refinement results of X-ray diffraction pattern shows that CaMnO3 formed as a single phase, which has a structure orthorhombic (P n m a) with lattice parameters, a = 5.277 Å, b = 7.452 Å, and c = 5,261 Å. The atomic density of the refinement result is 4.591 gr.cm-3. The morphology of CaMnO3 sample has a good particle homogeneity with the particle size 1- 2 μm. The value of AC conductivity on the CaMnO3 is directly proportional with the increasing ofthe temperature. The highest value of the AC conductivity of the CaMnO3 sample is 2.8 x 10-3 S/cm at a temperature of 400°C.