Enhanced low electric-field energy-storage performance in Ba0.9Sr0.1TiO3-Bi(Mg1/2Ti1/2)O3 ceramics

Abstract

Perovskite (1-x)Ba0.9Sr0.1TiO3-xBi(Mg1/2Ti1/2)O3 (BST-BiMT-x) ceramics were prepared by sintering the corresponding powders synthesized by combining of solid state reaction method with citrate sol-gel and selfcombustion techniques. Submicron grains morphology, high density and large resistivity were obtained in the BST-BiMT-x ceramics. In addition, the BST-BiMT-0.1 and BST-BiMT-0.075 ceramics exhibit ferroelectric hysteresis loops with slim shape which lead to enhanced energy-storage properties. The energy-storage density of these two ceramics increases almost linearly with increasing the applied electric filed. The energy-storage density and efficiency at 25 kV/cm of the BST-BiMT-0.1 and BST-BiMT-0.075 ceramics sintered at 1200?C are 141.2mJ/cm3 and 79.3%, and 158.1mJ/cm3 and 76.7%, respectively, surpassing many recently reported values for ferroelectric/antiferroelectric ceramics. The enhanced energy-storage density and efficiency under low electric field can be attributed to the slim polarization-electric field hysteresis loops, high density accompanied by submicron grains morphology and pure perovskite structure.

(Bi0.5Na0.5)(Zr0.97W0.01Fe0.02)O3 doping effects on KNN‐based lead‐free ceramics prepared via two‐step sintering technique

“…To further discuss the ferroelectrics type, the Curie‐Weiss law (Equation ) and exponential law (Equation ) were used to fit the dielectric data of the LNKNbS‐xBiNZWF ceramics above the T m temperature 43 $$$$\begin{equation}\varepsilon \; = C/\left( {T - {T_0}} \right)\;\end{equation}$$$$ $$$$\begin{equation}1/\varepsilon - \;1/{\varepsilon _m} = {\left( {T - {T_m}} \right)^\gamma }/C{\mathrm{^{\prime}}}\;.\end{equation}$$$$…”

“…To further discuss the ferroelectrics type, the Curie-Weiss law (Equation 1) and exponential law (Equation 2) were used to fit the dielectric data of the LNKNbS-xBiNZWF ceramics above the T m temperature. 43…”