Enhanced Dielectric and Energy Storage Properties in Fe-Doped BCZT Ferroelectric Ceramics

xmol% Fe-doped Ba(Zr0.2Ti0.8)O-3-50 mol%(Ba0.7Ca0.3)TiO3(abbreviated asxFe:BCZT) ferroelectric ceramics withx = 0, 0.075, 0.375, 0.75, 1.5, and 3 are fabricated via conventional solid-state reaction methods. Fe incorporates into the lattice, and all thexFe:BCZT ceramics show pure perovskite structure except 3Fe:BCZT ceramics in which tiny amount of iron oxide is detected via X-ray diffraction (XRD). The average grain sizes are significantly reduced from approximate to 20 to approximate to 2 mu m with increasing Fe-doping content. The Curie temperature ofxFe:BCZT ceramics decreases with increasing Fe-doping concentration and the room temperature dielectric constant significantly increased. Polarization hysteresis loops become slim after Fe-doping. The recoverable energy storage densityW(rec)ofxFe:BCZT ceramics is slightly enhanced to 0.240 J cm(-3)with an energy storage efficiency eta% = 70.1% atx = 0.075 underE-field of 50 kV cm(-1). The eta% can be enhanced to as high as 93.8% atx = 3 withW(rec) = 0.153 J cm(-3)due to a slimP-Eloops via Fe-doping. The results indicate a potential method to fabricate high efficiency energy storage materials via Fe-doping.