Synthesis, Characterization and Property Evaluation of Single Phase MgNb2O6 by Chemical route

Columbite - like MgNb2O6 single phase powder sample with orthorhombic crystal structure has been successfully synthesized by chemical process with starting material Nb2O5 and hydrofluoric acid (HF). MgNb2O6 is characterized by thermogravimetric and differential thermal analysis (TG- DTA), X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM) and energy dispersive X-ray (EDX). Optical behavior is studied by diffuse reflectance spectroscopy and dielectric property is also measured in this investigation. The effect of annealing temperature, phase formation, chemical composition, morphology, band gap energy and dielectric behavior of single phase MgNb2O6 are examined. Average crystallite and particle size of single phase MgNb2O6 material is measured around 40nm and 47.5nm from XRD and HRTEM analysis respectively. The direct band gap energy is measured about 3.01eV from diffuse reflectance spectroscopy analysis. Dielectric constant of MgNb2O6 material is obtained to be 21.20 at 110MHz frequency.