Influence of manganese (Mn) substitution on structural, infrared and dielectric properties of BaTiO3 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 P 4 mmm , while x = 0.15, 0.25 shows the hexagonal structure with space group P 63 mmc . 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 BaTiO 3 leads to phase transformation from tetragonal to hexagonal structure and shows strong frequency dependence.