Characterization and Studies on AC Conductivity of CaMnO₃ Material

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.