Loading...
Synthesis and Characterization of KNN Modified BNT-ST Ceramics for Energy Storage Applications
Author(s)
Date Issued
January 1, 2021
Type
Article
Abstract
Lead-free [(0.76-x)Bi0.5Na0.5TiO3–0.24SrTiO3–x(K0.5Na0.5)NbO3; BNT-ST-KNN] ceramics with x = 0, 0.03, 0.05, 0.07, 0.10, 0.15 wt.% were synthesized by using a solid-state reaction method. The effect of x content on phase, microstructure electrical and energy density properties was investigated. The samples were analyzed by X-ray diffraction (XRD) and the XRD patterns were fitted using the Rietveld refinement. The grain growth is obviously inhibited and smaller grains are formed in the ceramic samples at a high concentration of x. Dielectric study confirmed relax or nature with a drastic decrease of T max with the increase of x content in BNT-ST-KNN system. The maximum density (ρ = 5.42 (Formula presented.) 0.13 g/cm3), highest dielectric constant (εr =3300) with tanδ∼0.05, high recoverable energy storage density (W rec=0.16 J/cm3) with energy storage efficiency of (η = 64) were obtained in x = 0.03 wt.% ceramic samples, which suggested its usefulness for energy-storage capacitor applications.
Citation
Integrated Ferroelectrics, 223(1), 235-245, 2021