Improved Dielectric and Energy Storage Properties of Ba0.8Ca0.2TiO3 Ceramics by Doping Ba(Mg1/3Nb2/3)O3. Issue 10 (23rd March 2021)

• Record Type: Journal Article
• Authors: Zhang, Yucong; Wu, Chen; Fang, Yu; Liu, Changyi; Ge, Wenwei; Zhao, Hongwei; Yuan, Hongming
• Is Part Of: Physica status solidi. Volume 218:Issue 10(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-03-23
• Subjects: barium titanate -- ceramics -- dielectric -- energy storage -- ferroelectrics; Solid state physics -- Periodicals; Solids -- Industrial applications -- Periodicals; 530.41
• DOI: 10.1002/pssa.202100062
• Languages: English
• ISSNs: 1862-6300

Abstract

Abstract : Lead‐free Ba0.8 Ca0.2 TiO3 – x mol%Ba(Mg1/3 Nb2/3 )O3 (abbreviated as BCT20– x BMN, x = 0–8) ceramics are fabricated by a conventional solid‐state reaction method. All BCT20– x BMN ceramics have pure perovskite phases which gradually change from tetragonal phase to cubic phase. The average grain size decreases significantly from ≈23 to ≈1.2 μm with the increase in BMN content. The T m corresponding to the dielectric maximum of BCT20– x BMN decreases with the increase in x, and the room temperature dielectric constant increases significantly. The recoverable energy storage density W rec and efficiency η % are enhanced to 0.17 J cm −3 and 81.3% for BCT20–6BMN due to the reduced remanent polarization by BMN doping. The W rec increases with increasing temperature and shows peak values near the T m . The η % of BCT20–6BMN and BCT20–7BMN has good temperature stability due to enhanced relaxor behavior. Abstract : A x mol% Ba(Mg1/3 Nb2/3 )O3 ‐doping in Ba0.8 Ca0.2 TiO3 (abbreviated as BCT20– x BMN) 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.