Influence of manganese (Mn) substitution on structural, infrared and dielectric properties of BaTiO 3 nanoceramics

In the present study, pure barium titanate (BT) and Mn-doped barium titanate nanoceramics were synthesized by sol–gel auto-combustion method. X-ray diffraction (XRD) technique was employed to identify the phase purity and crystal structure of prepared nanoparticles. The analysis of XRD suggests that the sample x = 0.00, 0.05 possess a tetragonal structure with space group P4mmm, while x = 0.15, 0.25 shows the hexagonal structure with space group P63mmc. Using XRD data, the lattice constant ‘a’ and ‘c’ was determined for all the samples. The other structural parameters such as c/a unit cell volume, crystallite size, X-ray density, and lattice strain, were also obtained using XRD data. The dielectric study was carried out using LCR-Q meter as a function of frequency. All the dielectric parameters get decreased with increasing frequency. Thus, the doping of Mn in BaTiO3 leads to phase transformation from tetragonal to hexagonal structure and shows strong frequency dependence.