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Grain size effect and microstructure influence on the energy storage properties of fine‐grained BaTiO 3 ‐based ceramics
Author(s) -
Liu Baibo,
Wang Xiaohui,
Zhang Ruoxi,
Li Longtu
Publication year - 2017
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.14802
Subject(s) - materials science , microstructure , sintering , ceramic , grain size , grain boundary , doping , energy storage , grain growth , mineralogy , composite material , chemical engineering , optoelectronics , chemistry , power (physics) , physics , quantum mechanics , engineering
The dependence of energy storage properties on grain size was investigated in BaTiO 3 ‐based ferroelectric ceramics. Modified BaTiO 3 ceramics with different grain size were fabricated by two‐step sintering method from BaTiO 3 powders doped with Al 2 O 3 and SiO 2 by aqueous chemical coating. For samples doped with ZnO sintering aid in addition to Al 2 O 3 ‐ SiO 2 , the density and breakdown strength increased significantly. In general, samples with smaller grains have lower polarization but higher energy storage efficiency. Al 2 O 3 ‐ SiO 2 ‐ ZnO ‐doped samples with average grain size of 118±2 nm have an energy density of 0.83±0.04 J/cm 3 . Obvious segregation of doping elements in second phase and grain boundary was observed by TEM ‐ EDS . Impedance spectroscopy further explains the relationship between microstructure and properties. Compared to common energy storage ceramics, the grain size of this low‐cost ceramics sintered at relatively low temperature is small, and the pilot scale production has been well completed. All these features make the utilization in multilayer devices and industrial mass production possible. In addition, the obtained rules are helpful in further development of energy storage ceramics.