Synthesis and Spectral Characterizations of Nano-Sized Lithium Niobate (LiNbO_3) Ceramic

摘要

Background: Lithium Niobate (LiNbO_3) is a ferroelectric material suitable for a variety of applications. Its versatility is made possible by the excellent electro-optic, nonlinear, and piezoelectric properties of the intrinsic material. Objective: Study of structural, microstructural and electrical properties are to understand the structure and topography of the composites. Methods: The sample of LiNbO_3 was prepared by solid state reaction method at high temperature using high purity ingredients. Results: The analysis of the X-ray diffraction at room temperature confirmed the trigonal structure. The grains are more or less homogeneously distributed throughout the surface. The dielectric constant and dielectric loss are decreases with increase in frequency. The material has high dielectric constant and low dielectric loss at room temperature. The magnitude of real impedance decreases with rise in temperature which shows negative temperature coefficient of resistance behavior. The nature of the conductivity in solids is analyzed which obeyed Jonscher's power law. The temperature-dependence of dc conductivity indicates that the electrical conduction in the material is a thermally activated process. Conclusion: The compound exhibits a dielectric anomaly at high temperature suggesting ferroelectric-para electric phase transition. The activation energy of the material is found to be 0.00184 eV in the high temperature region of Arrhenius plot for electrical conductivity. The nature of temperature dependence of the dc conductivity exhibited the NTCR behaviour of the material.