Dielectric and energy-storage properties of Ba0.85Ca0.15Zr0.10Ti0.90O3 ceramics with BaO-Na2O-Nb2O5-WO3-P2O5 glass addition

TL;DR

This study investigates lead-free BCZT ceramics with BNNWP glass additions, revealing phase stability, grain size reduction, and enhanced energy storage properties, notably achieving a high energy density of 0.52 J/cm3.

Contribution

It demonstrates the effect of BNNWP glass addition on phase composition, microstructure, and energy storage performance of BCZT ceramics, introducing a method to enhance energy density.

Findings

BCZT ceramics contain tetragonal phase with BNNWP additions

Grain size decreases with more glass additive

Maximum energy density of 0.52 J/cm3 at 135kV/cm

Abstract

Lead-free Ba0.85Ca0.15Zr0.10Ti0.90O3 (BCZT) ceramics with different BaO-Na2O-Nb2O5-WO3-P2O5 (BNNWP) glass content, forming (1-x)BCZT-xBNNWP lead-free ceramics (abbreviated as BCZTx; x=0, 2, 4, 6, and 8wt%) were synthesized using the conventional solid-state processing route. The XRD investigation shows the coexistence of tetragonal and orthorhombic phases in BCZT pure. Likewise, only the tetragonal phase was detected in BCZTx (x = 2-8 wt%) ceramics. The SEM findings indicate that the average grain size decreases as the amount of BNNWP glass additives increases. In addition, BCZT ceramics Amodified with glass additions showed narrower hysteresis loops and a large electric field. The BCZT4 showed the highest recovered energy density of 0.52 J/cm3 at 135kV/cm with an energy storage efficiency of 62.4%, which is increased by 6.6 compared to BCZT0 (0.075 J/cm3). The energy density was also calculated using the Landau-Ginzburg-Devonshire (LGD) theory