Enhanced Dielectric and Energy Storage Properties in Fe‐Doped BCZT Ferroelectric Ceramics. Issue 16 (8th July 2020)

• Record Type: Journal Article
• Authors: Gao, Mingze; Ge, Wenwei; Li, Xia; Yuan, Hongming; Liu, Changyi; Zhao, Hongwei; Ma, Yaqing; Chang, Yunfei
• Is Part Of: Physica status solidi. Volume 217:Issue 16(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-07-08
• Subjects: barium titanate -- dielectric -- energy storage -- ferroelectric ceramics; Solid state physics -- Periodicals; Solids -- Industrial applications -- Periodicals; 530.41
• DOI: 10.1002/pssa.202000253
• Languages: English
• ISSNs: 1862-6300

Abstract

Abstract : x mol% Fe‐doped Ba(Zr0.2 Ti0.8 )O3 ‐50 mol%(Ba0.7 Ca0.3 )TiO3 (abbreviated as x Fe: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 x Fe: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 x Fe: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 W rec of x Fe: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 W rec = 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. Abstract : x mol% Fe‐doping in Ba(Zr0.2 Ti0.8 )O3 ‐50 mol%(Ba0.7 Ca0.3 )TiO3 (abbreviated as x Fe‐BCZT50) ferroelectric ceramics can significantly shift the phase boundary to low temperature and reduce average grain size, which makes the enhancement in dielectric and energy storage properties.