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Improved Dielectric and Energy Storage Properties of Ba 0.8 Ca 0.2 TiO 3 Ceramics by Doping Ba(Mg 1/3 Nb 2/3 )O 3
Author(s) -
Zhang Yucong,
Wu Chen,
Fang Yu,
Liu Changyi,
Ge Wenwei,
Zhao Hongwei,
Yuan Hongming
Publication year - 2021
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.202100062
Subject(s) - doping , dielectric , materials science , ceramic , mineralogy , analytical chemistry (journal) , engineering physics , physics , optoelectronics , chemistry , metallurgy , chromatography
Lead‐free Ba 0.8 Ca 0.2 TiO 3 – x mol%Ba(Mg 1/3 Nb 2/3 )O 3 (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.