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

Abstract

x mol% Fe‐doped Ba(Zr0.2Ti0.8)O3‐50 mol%(Ba0.7Ca0.3)TiO3 (abbreviated as xFe:BCZT) ferroelectric ceramics with x = 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 the xFe: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 ≈20 to ≈2 μm with increasing Fe‐doping content. The Curie temperature of xFe: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 density Wrec of xFe:BCZT ceramics is slightly enhanced to 0.240 J cm−3 with an energy storage efficiency η% = 70.1% at x = 0.075 under E‐field of 50 kV cm−1. The η% can be enhanced to as high as 93.8% at x = 3 with Wrec = 0.153 J cm−3 due to a slim P–E loops via Fe‐doping. The results indicate a potential method to fabricate high efficiency energy storage materials via Fe‐doping.

Investigations on phase coexistence and functional properties of BCZT lead-free piezoceramic

“…[19] Moreover, the terraced surface and intergranular pore were found, as indicated by the arrows in Figure 1(b). This terraced surface was also observed in the BCZT ceramic prepared by modified Pechini and hydrothermal methods as reported in the literatures [20,21]. The presence of terraced surfaces is probably due to the occurrence of 90 domain wall of tetragonal phase as observed in pure BaTiO3 ceramic [21].…”

Composition-driven phase coexistence and functional properties of the (1-x)BZT-(x)BCT ceramics near the phase convergence region

“…Further analysis of phase identification by full-pattern refinement is shown later in Figure 3. In addition, the substitution of small Ca 2+ (1.34 Å) into Ba 2+ (1.61 Å) and large Zr 4+ (0.86 Å) into Ti 4+ (0.745 Å) caused a slight drop of lattice spacing, resulting in a gradual shift of SXPD pattern to higher 2θ as BCT content increased [18,19]. The coexisting phases of the (1-x)BZT-(x)BCT ceramics were identified by full-pattern refinement, as illustrated in Figure 2.…”

Energy Storage Properties of Mn and Y Codoped Ba0.67Sr0.33TiO3 Ceramics

“…[6,7] Recently, BST materials have been studied in energy storage. [8][9][10][11][12] The energy storage properties of BST ceramics could be modified by adding dopants or improving preparation technology. The spark plasma-treated BST ceramics showed the recoverable energy density (W re ) of 1.2 J cm À3 .…”

“…The spark plasma‐treated BST ceramics showed the recoverable energy density ( W re ) of 1.2 J cm −3 . [ 12 ] (1 − x )(0.65BaTiO 3 ‐0.35Bi 0.5 Na 0.5 TiO 3 )‐ x Na 0.73 Bi 0.09 NbO 3 ceramic showed W re of 1.7 J cm −3 . [ 13 ] A large W re of 2.51 J cm −3 was obtained in 0.92BaTiO 3 ‐0.08K 0.73 Bi 0.09 NbO 3 ceramics.…”