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Defect dipoles induced high‐energy storage density in Mn‐doped BST ceramics prepared by spark plasma sintering
Author(s) -
Huang Yu Hui,
Liu Bing,
Liu Xiao Qiang,
Li Juan,
Wu Yong Jun
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16088
Subject(s) - spark plasma sintering , materials science , microstructure , sintering , dielectric , doping , analytical chemistry (journal) , ceramic , lattice constant , grain size , activation energy , mineralogy , dielectric loss , conductivity , composite material , chemistry , optics , optoelectronics , chromatography , physics , diffraction
Ba 0.5 Sr 0.5 TiO 3 ceramics with different Mn‐doping amount (Ba 0.5 Sr 0.5 Ti 1‐ x M n x O 3 , x = 0, 0.1%, 0.3%, 0.5%) were prepared by spark plasma sintering method. The single phase with cubic structure symmetry was confirmed and a gradual increase in lattice parameter with increasing x was observed. Fine grains with dense microstructure were revealed from the SEM images, while an obvious increase in grain size was detected when x = 0.5%. An optimized doping amount of 0.3% was determined, showing high dielectric constant ( ε r ≈ 2190), low dielectric loss (tan δ ≈ 2.78 × 10 −3 ), enhanced breakdown strength (290 kV /cm), and high‐energy storage density (1.69 J/cm 3 ) at room temperature. A possible mechanism, namely defect dipoles formation mechanism, was employed to explain the optimization of energy storage performance, and further confirmed from the variation in AC conductivity.