Structural, dielectric and optical analysis of Li1.1−yNb0.9-3yTi0.1+4yO3 M-phase solid solutions

The present paper reports the structural, dielectric and optical analysis of the M-phase Li1.1−yNb0.9-3yTi0.1+4yO3 (y=0.00, 0.045, 0.09, 0.11, 0.135) solid solutions in the Li2O-Nb2O5-TiO2 ternary system prepared by conventional solid state reaction method. High density (relative density>91%) ceramics were obtained by sintering the solid solutions at 1100 °C. XRD spectra revealed these ceramics to exhibit hexagonal structure and the superstructure formation was observed for higher Ti content (≥28 mol%) samples. Plate-like shape and closely packed grains were formed with low porosity (≤10%). Particle size was obtained in the range of 392-235 nm using TEM images. Relative permittivity changed from 46 to 31 while temperature coefficient of resonant frequency ranged from −93.5 to 57.5 at 1 MHz frequency. The maximum photoluminous intensity of 203.13 for the emission peak at 453 nm (blue emission) was observed for the sample y=0.00.